The Epistemology of Disagreement: Hume, Kant, and the Current Debate
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Marquette University e-Publications@Marquette Dissertations, Theses, and Professional Dissertations (2009 -) Projects The Epistemology of Disagreement: Hume, Kant, and the Current Debate Robert Kyle Whitaker Marquette University Follow this and additional works at: https://epublications.marquette.edu/dissertations_mu Part of the Philosophy Commons Recommended Citation Whitaker, Robert Kyle, "The Epistemology of Disagreement: Hume, Kant, and the Current Debate" (2020). Dissertations (2009 -). 903. https://epublications.marquette.edu/dissertations_mu/903 THE EPISTEMOLOGY OF DISAGREEMENT: HUME, KANT, AND THE CURRENT DEBATE by Robert Kyle Whitaker A Dissertation submitted to the Faculty of the Graduate School, Marquette University, in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Milwaukee, Wisconsin May 2020 ABSTRACT THE EPISTEMOLOGY OF DISAGREEMENT: HUME, KANT, AND THE CURRENT DEBATE Robert Kyle Whitaker Marquette University, 2020 The epistemological issue of disagreement comprises several related problems which arise in relation to disagreeing with another person. The central questions at issue are: (1) Can a body of evidence confer rationality on opposed propositions? (2) What is the relevance of unshareable evidence to disagreement? (3) What are one’s epistemic responsibilities in the context of disagreement? I consider several arguments from the recent disagreement literature which suggest that reasonable disagreements between people who have shared their evidence and are epistemic peers--i.e., they are equally informed about the disputed issue, and are roughly equal with respect to intelligence, thoughtfulness, carefulness, alertness, and so on--are not possible. I also consider several arguments which suggest that one may rationally persist in one’s views in spite of peer disagreement. In the course of considering these arguments, I discuss the role of “evidential seemings,” seemings of the form “It seems to one that evidence E supports proposition p”; their analogous relationship to perceptual seemings; and how such seemings might be outweighed by higher-order evidence provided by peer disagreement. I propose that the most difficult and interesting aspect of the peer disagreement problem is prolonged disagreement with a recognized epistemic peer, which may undermine one’s evidential seemings in the form of Parity: in the context of peer disagreement, both parties may be aware that things would seem just the same to them as they do if in fact the other party were correct and they were mistaken. This presents a localized skeptical problem that affects what one should believe in the context of such a disagreement, because prolonged peer disagreement puts one’s own evidential seemings into conflict. I propose and discuss three possible solutions to the Parity Problem, one inspired by David Hume, and two inspired by Immanuel Kant: (1) Practical considerations stemming from the underdetermination of one’s views by the available evidence as well as one’s larger epistemic goals can justify maintaining one’s view. Alternatively, judgments that someone else is an epistemic peer may be classified as either (2) empty regulative theoretical judgments (a Kantian category), or (3) non-theoretic judgments (analogous to judgments about taste). In either case, rational disagreement under Parity is possible. i ACKNOWLEDGEMENTS Robert Kyle Whitaker I would like to thank my dissertation director, Prof. Michael Wreen, for his patient guidance throughout this project. My ability to write and assess arguments is in large part due to him, as he was my professor for graduate logic and several courses on analytic philosophy. Any argumentative errors that may remain in this work are likely due to my failing to consider his advice more carefully. I also want to thank Dr. Noel Adams and Dr. Stanley Harrison for serving on my dissertation committee, and for the positive influence--both professional and personal--they’ve had on me during my graduate studies. Dr. Adams introduced me to Søren Kierkegaard, and Dr. Harrison to C.S. Peirce, two philosophers from whom I will continue to learn for the rest of my life. I am indebted to Drs. Adams and Harrison for these introductions, and for representing those great philosophers so well. I would like to extend special thanks to Dr. Paul Moser for serving as outside reader on this project. I have benefitted greatly from his work in both epistemology and philosophy of religion, as well as from the graduate seminar on Kierkegaard that I was fortunate to take with him. In many ways he serves as a model for me of Christian philosophy done well: with rigor, inclusion, and guided by a genuine faith. I am grateful for this example. There are many others who were not engaged directly in this project, but whose influence has in one way or another contributed to its completion. Thanks are due to all of those who have taught me to think clearly, and shown me by example the difference that philosophy can make with respect to forming a good character. These people include Dr. Cynthia Gayman, Dr. Rory Goggins, Dr. Theresa Tobin, Dr. Nancy Snow, Dr. Bronwyn Finnigan, and many others. In addition, I must thank my fellow Marquette graduate students, whose friendships have sustained me through this process, especially Nick Oschman, Brett Yardley, and Shaun Blanchard. I have learned as much from them about how to be a scholar as anyone, and they’ve all provided much needed levity and kindness. Finally, to my family. My parents, George and Linda Whitaker, first told me that I was capable, and guided me to many of the ideas that still occupy my attention. They gave support of every kind at every stage of my studies, and never once was any condition attached. And to my wife, Emily, the biggest thanks of all. Her contributions are too many and too varied to name. Completing a dissertation while remaining mentally healthy is a difficult task, and my accomplishment of it is due almost solely to her. ii TABLE OF CONTENTS ACKNOWLEDGEMENTS ...................................................................................... i INTRODUCTION .................................................................................................... 1 CHAPTER 1: CAN EVIDENCE SUPPORT OPPOSED PROPOSITIONS? ....... 10 1.1: Peter van Inwagen on Evidence and Exclusivity ....................................... 10 1.2: Richard Feldman’s Uniqueness Thesis ...................................................... 19 CHAPTER 2: PRIVATE EVIDENCE ................................................................... 33 2.1: Van Inwagen on the Use of Private Evidence ............................................ 33 2.2: Feldman on the Relevance of Private Evidence ......................................... 40 2.3: Christensen on the Symmetry of Private Evidence .................................... 46 CHAPTER 3: THE PERCEPTUAL ANALOGY .................................................. 54 3.1: Perceptual Seeming in the Disagreement Debate ...................................... 54 3.2: Implications of the Analogy ....................................................................... 62 CHAPTER 4: THE EVIDENTIAL VALUE AND DEFEAT OF SEEMINGS .... 69 4.1: Rosen on the Contingency of Evidential Seemings ................................... 69 4.2: The Epistemic Parity of Seemings ............................................................. 81 CHAPTER 5: THE EVIDENTIAL VALUE OF DISAGREEMENT ITSELF ..... 95 5.1: Idealization, Independence, and Bootstrapping ......................................... 95 5.2: Christensen on Symmetry between Apparent Peers ................................ 103 CHAPTER 6: HIGHER-ORDER EVIDENCE AND TESTIMONY .................. 110 6.1: The Meta-Evidence Principle ................................................................... 110 6.2: Disagreement and Testimony ................................................................... 122 iii 6.3: The Problem of Possible Rational Disagreement ..................................... 130 CHAPTER 7: PEERHOOD, CONFORMISM, AND NONCONFORMISM ..... 140 7.1: Defining Peerhood .................................................................................... 140 7.2: Responding to Parity: Conformism and Nonconformism ........................ 149 CHAPTER 8: PROPOSED SOLUTIONS I: HUME’S CONTRIBUTION ........ 161 8.1: A Humean Approach to Disagreement .................................................... 162 8.2: Moffett’s Millian Solution to Peer Disagreement .................................... 172 8.3: Hume Again ............................................................................................. 180 CHAPTER 9: PROPOSED SOLUTIONS II: KANT’S CONTRIBUTION ....... 187 9.1: Kant’s Categories of Judgments and Disagreement ................................. 187 9.2: Conclusion ................................................................................................ 196 CONCLUSION .................................................................................................... 200 BIBLIOGRAPHY ................................................................................................ 206 1 Introduction The literature on the epistemology of disagreement contains several questions that must be clearly distinguished. A survey of this literature yields many similar but distinct emphases with respect to what the debate over rational disagreement is fundamentally about. If we ask, “What is the guiding question in this debate?” the answer is: There is no single guiding