Some have argued that specifically moral demands or norms are justified by the constraints of rationality. On this view, any agent who comes to doubt, challenge, or reject the authority of moral demands does so on penalty of irrationality. According to this view, the agent who asks the question Why be moral? can be given a rational justification for the demands that morality makes on her, regardless of her individual reasons and motives. ;I consider amoralism as a test case. Could (...) a proposed justification of morality answer to the amoralist? I develop two characterizations of amoralism: the principled objector and the amoralist from indifference. I argue that normal moral agents may adopt or succumb to either type of amoralism without forfeiting their claim to rationality, and further, that such amoralists are not best understood as demanding a justification of morality. ;Some philosophers have objected that the notion of amoralism is conceptually mistaken or incoherent. I address three forms of this argument. First, I argue that the inverted-commas argument attributed to R. M. Hare fails to show that purported amoralists cannot really make or understand value judgments. Second, I argue that Michael Smith's internalist argument against amoralism is unconvincing. Third, I consider Christine Korsgaard's argument in The Sources of Normativity that the very nature of rational action entails moral obligation. ;I conclude by discussing the way in which a justification of moral demands can only be made internal to a particular moral outlook or way of life. To attempt to respond to amoralists who are radically dissatisfied with, or dissociated from, a moral perspective with a wholesale rational justification of morality is to misunderstand the nature of their disaffection as well as to misunderstand the project of moral philosophy. However, acknowledging the limited role of justification in moral theory and argument does not entail that moral philosophy's primary enterprise is merely the explanation of moral phenomena. Moral normativity is a function of our capacity for reflection. Thus, the work of moral philosophy lies in making reflective recommendations for which norms to adopt, how to obligate oneself and others, and how to live. (shrink)