If you spent one night in prison, or even walked through one, you would not wish that "reward" on your worst enemy;
It is evident that some thrive in that environment. Modern prisons are well designed. An older one perhaps would be harsh to live in--but today, where a prisoner is not forced to do any labor, can get free education and medical care,free meals and clothing--well, it beats being in the real world where you have to earn all those things.
If prison is so bad, why the high rate of recividism?