The law is not dependent on retributivism. No, but in many states, ours included part of the justification for punishment. In fact, the new model, pedal code, doubles down on retributivism as the primary justification. We are more allies than we are foes when it comes to reforming the criminal justice system. But i think you inadvertently leave too much on the field to to satisfy the retributivist.
The concept of free will is profoundly important to our self-understanding, our interpersonal relationships, and our moral and legal practices. If it turns out that no one is ever free and morally responsible, what would that mean for society, morality, meaning, and the law? Just Deserts introduces the concepts central to the debate about free will and moral responsibility by way of an entertaining, rigorous, and sometimes heated philosophical dialogue between two leading thinkers.