I don’t see why rehabilitation wouldn’t work. It either works or doesn’t. And OP says nothing about being a multiple rapist. Sure, maybe some crimes like murder you forfeit the right to be rehabilitated, but that isn’t what has been charged here.

And, sorry, violent crime can be every bit as intentional and sadistic as rape.

And where is your evidence he was just tossed on the street? He no doubt is being monitored by a parole officer and may very be receiving behavioral modification therapy.

And you are not merely making life “harder” you are making life impossible and pushing him to reoffend.