p. 1 Justifying Reasons, Motivating Reasons, and Agent Relativism in Ethics JOHN J. TILLEY INDIANA UNIVERSITY–PURDUE UNIVERSITY INDIANAPOLIS
[email protected] From: Philosophical Studies 118(3) (2004): 373–99. Please cite the published version. ABSTRACT. According to agent relativism, each person’s moral requirements are relative to her desires or interests. That is, whether a person morally ought to φ depends on what interests or desires she has. Some philosophers charge that the main argument for agent relativism trades on an ambiguity—specifically, an ambiguity in “reason,” “reason for action,” or a kindred term. This charge has been common, and widely thought to damage the case for agent relativism, since its appearance, in 1958, in a now classic paper by William Frankena. In what follows I examine the charge in detail, showing that insofar as it aims to discredit the argument for agent relativism, it fails in its purpose. Agent relativism is the view that each person’s moral requirements are relative to her desires or interests. Unless an action is suitably related to those desires or interests she has no moral requirement to perform that action.1 My concern is with the principal argument for this view, specifically with a frequent objection to it. According to that objection, the argument for agent relativism trades on an ambiguity in “reason,” “reason for action,” or a similar term. This objection has been prevalent since its appearance, in 1958, in a now classic paper by William Frankena.2 Strangely, although one or two authors 1 This, at least, is one of the views that go under the name “agent relativism.” I have used that name for a very different view in some of my other papers, e.g., in “Cultural Relativism,” Human Rights Quarterly 22(2) (2000): 501–47, at 506.