When the state punishes a person, it treats him as it ordinarily should not. It takes away his property, throws him in prison, or otherwise interferes with his liberty. Theories of punishment try to explain why such harsh treatment is nonetheless morally permissible, if not morally obligatory. Such theories often seem to take for granted that the state in question is an upright one. Among other things, the states in which we live fail, one might reasonably believe, to distribute wealth and power fairly among their citizens. Nor are the criminal justice systems they superintend flawless, not least of which because they sometimes convict and punish the innocent. So even if an ideal state is morally permitted (or even obligated) to punish, can...