They're not intended to be cellar Safe Rooms furnished with a MY PILLOW® and mom's home cooking 3 times a day.
The idea is that they should be uncomfortable enough that once released a convict never wants to return.
I think a return to remotely located prisons with hard labor like busting rocks all day would solve a lot of problems and cut way down on recidivism.
and toss in a chain-gang trimming the weeds along the roadway. /not sarc