Given that persons typically have a right not to be subjected to the hard treatment of punishment, it would seem natural to conclude that the permissibility of punishment is centrally a question of rights. Despite this, the vast majority of theorists working on punishment focus instead on important aims, such as achieving retributive justice, deterring crime, restoring victims, or expressing society's core values. Wellman contends that these aims may well explain why we should want a properly constructed system of punishment, but none shows why it would be permissible to institute one. Only a...