Vatican Insider: Pope: “Justice fails if prison fails to re-educate”
Should a punishment itself be meant to be rehabilitative? (In so far as it may be the occassion of repentence.) One must prepare the offender or criminal for reintegration into society, and supply the moral formation that he may not have received. But I would not consider this to be a part of the punishment itself, but a necessary supplement required by civic friendship and social justice.