Retributivists claim that punishment is morally justified if the offender deserves to be punished; the state should punish those found guilty of criminal offences to the extent that they deserve, because they deserve it. 

Consider the following argument in support of retributivism:

P.1: Human beings, unlike animals, are able to direct their own lives by thinking rationally and making choices.

P.2: When we hold someone responsible for their actions, we treat them with respect.

P.3: By punishing someone, we hold them responsible for their actions, thereby treating them with respect.

Conclusion: Punishment is morally justified. 

Which of the following is a possible objection to retributivism?