Gives them something to do besides learn how to shank people.
lol, yes, if you wanted to something nice for them you might do it, but it's not like they deserve it anyway.
Who are you to say what other people deserve and don't deserve? It is possible that some of those inmates did something morally or legally wrong because their sin/crime served some higher good. Perhaps they stole because they needed money to feed their families. Perhaps they attacked in self-defense. Perhaps they did drugs because they were psychologically broken. Perhaps they got caught attempting to board a plane with a revoked passport!
Lol, come on.
We also have a tremendous number of mentally ill people in our prisons, who are not receiving any treatment, same as the drug people. Because we think the way to get at them is to make life miserable, further ruining their mental states. But "they deserve it."