Abstract

We know what to say about the agent who knowingly does the wrong thing. But what of the wrongdoer who doesn't know everything that matters? Some of the usual criticisms may apply, if some of the usual mistakes were made. Other usual criticisms will miss the mark. One task for moral theory is to explain this variety of censures and failures. Derek Parfit proposes that we define for each criticism a sense of 'wrong', and that each new sense be defined in terms of the 'ordinary' sense. The authors argue in favor of another approach, inspired by Parfit's earlier work, requiring only one sense of 'wrong'. They conclude by showing that their own approach is also deeply flawed—that neither theory can explain the many ways to do wrong in ignorance of what matters. This is not a conclusion with which moral theorists should be happy.