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Logical Fallacies Moorpark College Writing Center
Logical Fallacies Moorpark College Writing Center Ad hominem (Argument to the person): Attacking the person making the argument rather than the argument itself. We would take her position on child abuse more seriously if she weren’t so rude to the press. Ad populum appeal (appeal to the public): Draws on whatever people value such as nationality, religion, family. A vote for Joe Smith is a vote for the flag. Alleged certainty: Presents something as certain that is open to debate. Everyone knows that… Obviously, It is obvious that… Clearly, It is common knowledge that… Certainly, Ambiguity and equivocation: Statements that can be interpreted in more than one way. Q: Is she doing a good job? A: She is performing as expected. Appeal to fear: Uses scare tactics instead of legitimate evidence. Anyone who stages a protest against the government must be a terrorist; therefore, we must outlaw protests. Appeal to ignorance: Tries to make an incorrect argument based on the claim never having been proven false. Because no one has proven that food X does not cause cancer, we can assume that it is safe. Appeal to pity: Attempts to arouse sympathy rather than persuade with substantial evidence. He embezzled a million dollars, but his wife had just died and his child needed surgery. Begging the question/Circular Logic: Proof simply offers another version of the question itself. Wrestling is dangerous because it is unsafe. Card stacking: Ignores evidence from the one side while mounting evidence in favor of the other side. Users of hearty glue say that it works great! (What is missing: How many users? Great compared to what?) I should be allowed to go to the party because I did my math homework, I have a ride there and back, and it’s at my friend Jim’s house. -
Chapter 4: INFORMAL FALLACIES I
Essential Logic Ronald C. Pine Chapter 4: INFORMAL FALLACIES I All effective propaganda must be confined to a few bare necessities and then must be expressed in a few stereotyped formulas. Adolf Hitler Until the habit of thinking is well formed, facing the situation to discover the facts requires an effort. For the mind tends to dislike what is unpleasant and so to sheer off from an adequate notice of that which is especially annoying. John Dewey, How We Think Introduction In everyday speech you may have heard someone refer to a commonly accepted belief as a fallacy. What is usually meant is that the belief is false, although widely accepted. In logic, a fallacy refers to logically weak argument appeal (not a belief or statement) that is widely used and successful. Here is our definition: A logical fallacy is an argument that is usually psychologically persuasive but logically weak. By this definition we mean that fallacious arguments work in getting many people to accept conclusions, that they make bad arguments appear good even though a little commonsense reflection will reveal that people ought not to accept the conclusions of these arguments as strongly supported. Although logicians distinguish between formal and informal fallacies, our focus in this chapter and the next one will be on traditional informal fallacies.1 For our purposes, we can think of these fallacies as "informal" because they are most often found in the everyday exchanges of ideas, such as newspaper editorials, letters to the editor, political speeches, advertisements, conversational disagreements between people in social networking sites and Internet discussion boards, and so on. -
334 CHAPTER 7 INFORMAL FALLACIES a Deductive Fallacy Is
CHAPTER 7 INFORMAL FALLACIES A deductive fallacy is committed whenever it is suggested that the truth of the conclusion of an argument necessarily follows from the truth of the premises given, when in fact that conclusion does not necessarily follow from those premises. An inductive fallacy is committed whenever it is suggested that the truth of the conclusion of an argument is made more probable by its relationship with the premises of the argument, when in fact it is not. We will cover two kinds of fallacies: formal fallacies and informal fallacies. An argument commits a formal fallacy if it has an invalid argument form. An argument commits an informal fallacy when it has a valid argument form but derives from unacceptable premises. A. Fallacies with Invalid Argument Forms Consider the following arguments: (1) All Europeans are racist because most Europeans believe that Africans are inferior to Europeans and all people who believe that Africans are inferior to Europeans are racist. (2) Since no dogs are cats and no cats are rats, it follows that no dogs are rats. (3) If today is Thursday, then I'm a monkey's uncle. But, today is not Thursday. Therefore, I'm not a monkey's uncle. (4) Some rich people are not elitist because some elitists are not rich. 334 These arguments have the following argument forms: (1) Some X are Y All Y are Z All X are Z. (2) No X are Y No Y are Z No X are Z (3) If P then Q not-P not-Q (4) Some E are not R Some R are not E Each of these argument forms is deductively invalid, and any actual argument with such a form would be fallacious. -
How to Argue Without Being Argumentative
ENG 106: Composition II Learning Unit 9: Audio How to Argue Without Being Argumentative We should first of all begin by explaining the title of this lecture: “How to Argue Without Being Argumentative.” Whenever people think of “arguing” or “having an argument,” many of them have the wrong idea in mind. They think of people in an argument as disputing, contradicting each other, and even calling each other names, until gradually (or not so gradually) the argument gets louder and louder until the participants are yelling at each other and no longer even listening to the other side. In the popular view, this is what it means to be “argumentative,” and anyone who is arguing is by definition argumentative! However, in the academic view, this is not really what an argument is supposed to be like. An argument is simply a discussion in which statements called “premises” are joined together in order to reach a “conclusion.” These premises are supported by different types of “evidence.” So, for example, if one person says, “The President is doing a great job” and another says, “No, he isn’t” and the first says, “Yes, he is” and the second says, “No, he isn’t, you idiot”—these two people are not really arguing, even though it may sound like it. They are simply disputing, expressing their opinions, and contradicting each other. In order for this dispute to qualify as a real argument, each participant would need to offer premises which lead to the conclusion he or she wants to reach, either that the President is doing a good job or that the President is not doing a good job. -
Critical Thinking, Common Fallacies, and Leadership
Critical Thinking, Common Fallacies, and Leadership Judge Hal Campbell, Ph.D. One of my all-time favorite movies was Tom Clancy’s, Hunt for Red October. Within that movie there is a scene that I found fascinating within my capacity as a university professor teaching logic and statistics. The scene involves a meeting of top level decision makers who are gathered around a table in the basement of the Whitehouse, and after a briefing given by Jack Ryan pertaining to the design, construction, and launch of a new Russian submarine, the National Security Advisor who is chairing the meeting asks Admiral Greer (the character played by James Earl Jones) what conclusions he has made. The Admiral responded, “Sir, the data support no conclusions as of yet”. I thought this statement was one of the more profound expressions that I had ever heard in any movie. What an astonishing and refreshing response I thought to myself. He was exactly right that it was premature, given the limited information available at the time, to base any decision about the Russian’s intent, mission, or objectives. The data simply didn’t support any conclusion, yet there at the conference table, sat a gaggle of top-level executives who were actively engage in supposition and speculation resulting in the fabrication all sorts of boogie-men, end of day’s scenarios, and rationale for a first strike option that needed to be recommended to the President. As I have pointed out in previous articles, critical thinking, logic, and reasoning are not taught as a separate academic discipline within our K-12 school system. -
Logic and the Common Law Trial
University of Kentucky UKnowledge Law Faculty Scholarly Articles Law Faculty Publications Summer 1994 Logic and the Common Law Trial Richard H. Underwood University of Kentucky College of Law, [email protected] Follow this and additional works at: https://uknowledge.uky.edu/law_facpub Part of the Legal Profession Commons, and the Litigation Commons Right click to open a feedback form in a new tab to let us know how this document benefits ou.y Recommended Citation Richard H. Underwood, Logic and the Common Law Trial, 18 Am. J. Trial Advoc. 151 (1994). This Article is brought to you for free and open access by the Law Faculty Publications at UKnowledge. It has been accepted for inclusion in Law Faculty Scholarly Articles by an authorized administrator of UKnowledge. For more information, please contact [email protected]. Logic and the Common Law Trial Notes/Citation Information American Journal of Trial Advocacy, Vol. 18, No. 1 (Summer 1994), pp. 151-199 This article is available at UKnowledge: https://uknowledge.uky.edu/law_facpub/261 Logic and the Common Law Trial Richard H. Underwoodt The only certain ground for discovering truth is the faculty of discriminat- ing false from true.... Otherwise, I can assure you, you will be led by the nose by anyone who chooses to do it, and you will run after anything they hold out to you, as cattle do after a green bough.' I. Introduction Throughout history, right up to the present day, there have been persistent, if somewhat contradictory, attempts by members of the legal guild to attribute to the practice of law some of the characteristics of religion and science.' Fortunately, references to the trial lawyer as "the priest in the [T]emple of [J]ustice" 3 have pretty much disappeared from the literature. -
Informal Fallacies in Legal Argumentation
South Carolina Law Review Volume 44 Issue 2 Article 4 Winter 1993 Informal Fallacies in Legal Argumentation Kevin W. Saunders University of Oklahoma Follow this and additional works at: https://scholarcommons.sc.edu/sclr Part of the Law Commons Recommended Citation Kevin W. Saunders, Informal Fallacies in Legal Argumentation, 44 S. C. L. Rev. 343 (1993). This Article is brought to you by the Law Reviews and Journals at Scholar Commons. It has been accepted for inclusion in South Carolina Law Review by an authorized editor of Scholar Commons. For more information, please contact [email protected]. Saunders: Informal Fallacies in Legal Argumentation INFORMAL FALLACIES IN LEGAL ARGUMENTATION KEVIN W. SAUNDERS" I. INTRODUCTION ............................ 344 II. VARIETIES OF INFORMAL FALLACIES ............... 345 A. Argumentum ad Hominem .... ............ B. Argumentum ad Misericordiam . ............ C. Argumentum ad Populum ..... ............ D. Argumentum ad Vericundiam .. ............ E. Ignoratio Elenchi .......... ............ F. Petitio Principii ........... ............ G. Post Hoc Ergo Propter Hoc ... ............ H. Argumentum ad Ignorantiam ... ............ L Argumentum ad Terrorem .... ............ J. Argumentum ad Antiquitam ... ............ K. Accident and Hasty Generalization ........... L. Composition ............. ............ M. Division ............... ° . o ..° ° . N. Complex Question ......... ............° ° 0. Tu Quoque .............. ............° ° P. Ambiguity .............. ............ 1. Equivocation ......... -
Fallacies of Relevance1
1 Phil 2302 Logic Dr. Naugle Fallacies of Relevance1 "Good reasons must, of force, give place to better." —Shakespeare "There is a mighty big difference between good, sound reasons, and reasons that sound good." —Burton Hillis "It would be a very good thing if every trick could receive some short and obviously appropriate name, so that when a man used this or that particular trick, he could at once be reproved for it." —Arthur Schopenhauer Introduction: There are many ways to bring irrelevant matters into an argument and the study below will examine many of them. These fallacies (pathological arguments!) demonstrate the lengths to which people will go to win an argument, even if they cannot prove their point! Fallacies of relevance share a common characteristic in that the arguments in which they occur have premises that are logically irrelevant to the conclusion. Yet, the premises seem to be relevant psychologically, so that the conclusion seems to follow from the premises. The actual connection between premises and conclusion is emotional, not logical. To identify a fallacy of relevance, you must be able to distinguish between genuine evidence and various unrelated forms of appeal. FALLACIES THAT ATTACK I. Appeal to Force (Argumentum ad Baculum ="argument toward the club or stick") "Who overcomes by force has overcome but half his foe." Milton. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is like hitting below the intellect." Oscar Wilde 1 NB: This material is taken from several logic texts authored by N. -
The Limits of Logic in Politics
The Limits of Logic in Politics Dr. Mark Bauer Department of Philosophy Center for Bioethics and Humanities University of Colorado Denver |Anschutz Medical Center Reasoning as skilled activity Reasoning is activity. It is a skilled activity. It can be better or worse… … just as speaking Spanish, playing piano, or pulling a 720. “Better”,”worse”, “correct”, “incorrect”, “right”, and “wrong”, etc. presuppose standards. Validity: - the conclusion must be true if the premises are - it is impossible for the premises to be true and the conclusion false. Invalidity: - the conclusion need not be true if the premises are. - it is possible for the conclusion to be false even if the premises are true. Two related ways to go wrong: 1) Evidence fails to exclude alternative conclusions 2) Evidence is irrelevant to the exclusion of alternatives. Validity: the single standard of logic Add some facts: 1) Bob is in the western U.S.; and 2) Bob can see Paris the ocean. Valid Inference: Bob is in Seattle. Possibility Denver Space Seattle New York Add one fact: Bob is in the western Paris U.S. Invalid inference: Bob is in Seattle. Possibility Denver Space Seattle New Validity: York - the conclusion must be true if the premises are -it is impossible for the premises to be true and the conclusion false. Invalidity: - the conclusion need not be true if the premises are. - it is possible for the conclusion to be false even if the premises are true. Fragility points in core human reasoning • Ground floor cognitive processing • Emotive overrides • Base-line human learning system • Communicative bandwidth limits The Ground Floor: Conditionals and Disjunction Conditionals Disjunctions • A conditional is a statement composed of • A disjunction is a statement composed of at least two component statements in at least two component statements in which the truth of one is conditioned on which at least one component must be the other. -
Fallacies of Argument
RHETORIC Fallacies What are fallacies? Fallacies are defects that weaken arguments. By learning to look for them in your own and others' writing, you can strengthen your ability to evaluate the arguments you make, read, and hear. The examples below are a sample of the most common fallacies. Common Fallacies: Emotional—The fallacies below appeal to inappropriately evoked emotions instead of using logic, facts, and evidence to support claims. ● Ad Hominem (Argument to the Man): attacking a person's character instead of the content of that person's argument. Not simply namecalling, this argument suggests that the argument is flawed because of its source. For example, David Horowitz as quoted in the Daily Pennsylvanian: “Anyone who says that about me [that he’s a racist bigot] is a Nazi.” ● Argumentum Ad Ignorantiam (Argument From Ignorance): concluding that something is true since you can't prove it is false. For example "God must exist, since no one can demonstrate that she does not exist." ● Argumentum Ad Misericordiam (Appeal To Pity): appealing to a person's unfortunate circumstance as a way of getting someone to accept a conclusion. For example, "You need to pass me in this course, since I'll lose my scholarship if you don't." ● Argumentum Ad Populum (Argument To The People): going along with the crowd in support of a conclusion. For example, "The majority of Americans think we should have military operations in Afghanistan; therefore, it’s the right thing to do." ● Argumentum Ad Verecundiam (Appeal to False Authority): appealing to a popular figure who is not an authority in that area. -
So You Say: Demonstrated Facts V. Unsupported Assertions
So You Say: Demonstrated Facts v. Unsupported Assertions Prepared by: Toni Boone, Administrative Law Judge (retired) Nevada Department of Motor Vehicles and W. Michael Gillette, Associate Justice (retired) Oregon Supreme Court Shareholder: Schwabe, Williamson & Wyatt Prepared for: 2017 National Association of Hearing Officials Professional Development Conference Copyright © 2017 Ipse Dixit Publications Wilsonville, Oregon So You Say: Demonstrated Facts v. Unsupported Assertions © 2017 Ipse Dixit Publications 2017 National Association of Hearing Officials Professional Development Conference Page 1 So You Say: Demonstrated Facts v. Unsupported Assertions Toni Boone, Administrative Law Judge (retired) W. Michael Gillette, Association Justice, Oregon Supreme Court (retired) I. Burdens of Proof A. “Burden of Proof” Defined: 1. Duty placed upon a party to a civil or criminal action to prove or disprove a disputed fact. 2. “Burden of Proof” is also used as a synonym for “Burden of Persuasion” which is the quantum of proof by which the party with the burden of proof must establish or refute a disputed fact. B. Preponderance of the Evidence Defined: 1. Evidence, as a whole, shows fact to be proved is more probable than not. 2. The existence of the fact at issue is more likely than not. 3. The greater weight of the credible evidence. 4. More evidence or more credible evidence than evidence offered in opposition to it. C. Clear and Convincing Evidence Defined: The existence of a particular fact is highly probable or reasonably certain. This standard may be used in some jurisdictions when the issue is whether a person was guilty of deceit or fraud—a matter that had to be proved at common law by clear and convincing evidence, rather than by a mere preponderance. -
Appendix 1 a Great Big List of Fallacies
Why Brilliant People Believe Nonsense Appendix 1 A Great Big List of Fallacies To avoid falling for the "Intrinsic Value of Senseless Hard Work Fallacy" (see also "Reinventing the Wheel"), I began with Wikipedia's helpful divisions, list, and descriptions as a base (since Wikipedia articles aren't subject to copyright restrictions), but felt free to add new fallacies, and tweak a bit here and there if I felt further explanation was needed. If you don't understand a fallacy from the brief description below, consider Googling the name of the fallacy, or finding an article dedicated to the fallacy in Wikipedia. Consider the list representative rather than exhaustive. Informal fallacies These arguments are fallacious for reasons other than their structure or form (formal = the "form" of the argument). Thus, informal fallacies typically require an examination of the argument's content. • Argument from (personal) incredulity (aka - divine fallacy, appeal to common sense) – I cannot imagine how this could be true, therefore it must be false. • Argument from repetition (argumentum ad nauseam) – signifies that it has been discussed so extensively that nobody cares to discuss it anymore. • Argument from silence (argumentum e silentio) – the conclusion is based on the absence of evidence, rather than the existence of evidence. • Argument to moderation (false compromise, middle ground, fallacy of the mean, argumentum ad temperantiam) – assuming that the compromise between two positions is always correct. • Argumentum verbosium – See proof by verbosity, below. • (Shifting the) burden of proof (see – onus probandi) – I need not prove my claim, you must prove it is false. • Circular reasoning (circulus in demonstrando) – when the reasoner begins with (or assumes) what he or she is trying to end up with; sometimes called assuming the conclusion.