@bigheadfred@musiclady @Oceander @mystery-akI can speak directly to this as a friend of mine was an official in the largest Texas prison, where executions take place, Huntsville, TX. Criminals sentenced to death are kept there on death row. He lived in our county, not the county where the prison is, but it is easy travel distance to Huntsville. He was an election judge for us, so I was his friend.
Sometimes, he was the person who pushed the button to execute criminals. One day he told me, he was the person who pushed that button the day before to kill a criminal and he didn't feel bad about it as this criminal had killed several people. I don't remember how it came up, but he said there is no air conditioning in those buildings where the criminals are. He said they put themselves there and Texas wasn't going to pay to keep them comfortable.
Now, that is Texas, and the temps in summer in Texas are brutal, but when you think about it, the worst criminals in the state, should have thought about their future when they killed people or did other heinous criminal acts so bad they were in that prison. Perhaps the ones who get out will think about it before they do another criminal act to put themselves back in there.
The Texas Rehabilitation Agency would send ex-criminals to me be to tested when they got out of prison. The first question I ask them was this: "How many times were you put in isolation?" If they had not been, it was possible they could be rehabilitated. If a man cannot follow the rules in prison, and get put in isolation, it is less likely they can be rehabilitated. One ex-prisoner told me he was put in isolation when he got there because he told the warden what rules he would not follow while he was there. If he wouldn't follow the rules there, it was likely he wouldn't follow the laws after he got out.