I am not sure that you get a custodial sentence for nicking a bag of sweets and prisons do vary as to whether they are Mental Hospitals or prisons. My experience is limited to three, Wakefield Jail, Walton Prison and the Mental hospital just outside Maghull, Merseyside.
This is a complex problem, being what do we see the function of our prisons and how does one solve it to safeguard society?
If they are meant to be punishment, then fine, don't make it too comfy for the, but if it is rehabilitation, then treat the inmates as humans........in my opinion, both methods have failed as the re-offending rates remain the same or have risen.
Modern Prisons? a good idea.....but not in my backyard is the cry....so there is the first problem.
Remember folks that these people prey on the weak and are unable to follow the established laws to make a community safe.
Whatever one does, they are likely to re-offend......so..bang them up to protect society......it is unlikely to work, but for a period of time, one villain is taken out.
Butlins? 1953........fabulous....Skegness.