That's not true at all. When the prison spend years dehumanizing someone, taking all of their rights, constantly throwing abuse at them, and giving them no opp

That's not true at all. When the prison spend years dehumanizing someone, taking all of their rights, constantly throwing abuse at them, and giving them no opportunities for self improvement, that is part of the blame for them being unable to adapt and resorting to crime later. The prison systems, even when not outright physically abusing inmates (which is common enough in America) are full of psychological abuse and exploitation. Everything is charged at incredible rates, and these days they're locked down - "libraries" with very limited selection (no learning to program computers, that's dangerous) that cost money to access anything, bans on physical donations of books and other materials from relatives for "fear of contraband", an so much more.