Liberty is rendered even more precious by the recollection of servitude.
The reformative effect of punishment is a belief that dies hard, chiefly I think, because it is so satisfying to our sadistic impulses.
If you treat prisoners well, they will be less angry, less inclined to violence inside prison, less likely to provoke violent actions by guards, less likely to have reason to file brutality lawsuits that cost taxpayers a bundle and waste administrators' time. And most important, well-treated prisoners will be less likely to leave prison angrier, more vicious and more inclined to criminal behavior than when they went in.
I have paid no poll-tax for six years. I was put into a jail once on this account, for one night; and, as I stood considering the walls of solid stone, I could not help being struck with the foolishness of that institution which treated me as if I were mere flesh and blood and bones, to be locked up...I saw that, if there was a wall of stone between me and my townsmen, there was a still more difficult one to climb or break through, before they could get to be as free as I was.
It is certain that the study of human psychology, if it were undertaken exclusively in prisons, would also lead to misrepresentation and absurd generalizations.