First off, he is not going to camp jail. He will go to a max security place because he has every motive to attempt escape and no real consequences for doing so, plus he is a violent offender. He will be spending his time in the worst of the worst areas. There will be little to no opportunity for him to get out of the facility on any work or furloughs. He might go to a military work facility, I am not sure if the military still does that, but it will not be some pleasant place. Unlike prisoners with a release date or opportunities for parole he will know that he will never ever see freedom again. That is a thought that will torture him every day as he has nothing to distract him from thinking about what his friends and family are doing without him, and every little thing he enjoyed or took for granted when he had freedom. Trust me, until you see the moments of life pass like eons while you wish for anything but what you have, you have no clue what that is like. Visits from friends and family might be momentarily pleasant, but they arwe a huge reminder that life is going on outside and all you can do is wish you were somehow a part of it. A couple of minutes with those people is worth hours of mental torture later. Anything you have in prison can be taken away from you. You will be repeatedly naked and stripped of any privacy or dignity you thought you had. You will have people watching you when you crap, you will have people looking in your asshole because you moved locations, and you will have every part of your body examined and probed just because someone else said so.
Whether or not there is a hell or just nothing after death I say let us take the time to put these criminals through all of this. Nothing is too good for them, and hell will wait.