I don't care if they raped a dozen kids. Making yourself a murderer for their crimes doesn't help anything. You stick them in a nice little box where they can never have access to anyone vulnerable again, feed them, and ignore them. Becauseyou are better than them, and you do not abuse those who you have power over NO MATTER HOW GOOD IT WOULD MAKE YOU FEEL.
The social acceptability of abuse of a prisoner is not a measure of its rightness or justice.
And yes, I made an account over here just to say that.