They don't have to fear for their life on a 24/7 basis while doing hard time http://www.prisontalk.com/forums/showpost.php?p=3338209&post...
I understand the position that why should criminals get anything since they have nothing coming to them, but some sort of plan has to exist to stop the revolving recidivism door or even promote prison order. There's state prisons that now allow you to order (with your meagre work wages) takeout pizza and other food from restaurants close to the prison if you have good time credit. Apparently that is the best discipline motivator since nobody wants to risk losing their pizza and takeout privs.