I openly admit to not reading ALL comments prior to posting this, but.... I think the top level posters so far are missing the real issue here. These people are in Jail for a reason. Let's not treat them to things they do not deserve.
Jail should be a place to serve a sentance and to hopefully let the the criminals reflect on their crime and hopefully learn a lesson. It SHOULDN'T be a place where criminals get to hang out and play board games. That's just ridiculous. Yes, D&D and any other aformentioned board games are harmless, but enabling someone to have fun in a place of punishment is just downright absurd. I know people who have been to jail, and while they say it was absolutely no fun at all, their behavior after their sentance really didn't change.
The system is broken. We can't let people forget the reason they're being punished...
If they are not treated to any entertainment at all, they will become depressed and kill themselves. Clearly, this is not the intention of jail either, is it?
You assume a lot here. First you assume that they will become depressed. They may or may not, but speaking from my past experience in regards to my own bouts of depression, I have learned from my depression how to become a happier, more wholesome individual. Killing myself may have been an option, but I promise you the majority of depressed people don't just go kill themselves. And depressed or not, we can assume they're in jail for a reason. Good, feel bad about it. Ask yourself if doing what you did was worth the punishment...
I understand that you have some sort of sadistic need to see these people suffer, but there are limits to how you can treat people (yes, inmates are people too), both stemming from psychology and international law.
Now you're just name calling; a childish move. I wouldn't say not giving inmates entertainment is an act of treating people poorly.
People need to learn from their mistakes, and if they're not, then the time, effort, and money to put them in jail in the first place was a waste of time, and they won't be any better of a person when they leave there.