I have been in lots of prisons (in a professional capacity, not as an inmate!)
It's really not as luxurious as the DM makes out. Cells are small and basic. Sometimes inmates don't even have full privacy to go to the toilet. Bedding etc is quite primitive (thin mattresses and pillows, scratchy blankets).
I would be surprised if they had PS4s, assuming that is some kind of latest games console, I'm not sure. I don't know if they have Sky and if they do whether it is basic or luxury version - I can imagine it is very heavily controlled so inmates cannot see anything 'unsuitable' - anything that may give them ideas about escaping, anything remotely sexy, anything that may prejudice trials for example - they probably just have the national geographic channel and cartoon network
A lot of the activities are about learning skills to enable inmates to go back into society and hopefully stay on the straight and narrow - employment skills etc. And people that are kept occupied are less likely to cause trouble or reoffend.
Yes, they get fed, but I can assure the OP that the food is very basic, smells disgusting and is served at quite odd times of day (lunch at 11.30 am, evening meal 5/6 pm and then nothing until breakfast at 7/8 am).
Yes, some people are truely evil and you often think 'what are we doing spending tens of thousands per year keeping a bad person alive - I think the high security places cost about £50k/person per year.
But due to all the appeals etc, it isn't any cheaper to keep people on death row and it doesn't appear to be a deterrent to stop people commiting serious crime or behaving themselves while in prison. After all, if you are facing a death sentence you would have no disincentive against harming an officer or anyone else working in a prison would you?
And many prisoners come to quite an unpleasant end in prison too - other inmates often go after the really bad ones - there is quite a code of honour against those who have committed the most disgusting crimes, especially against women and children.
It's easy to have a gut feeling that we should just kill 'these people' but evidence suggests that society doesn't benefit overall from such a policy.