Actually, I found it very interesting when I asked 'the question.
What are murderers generally like?
I fully expected 'everyone is different blah blah blah.' She told me they were like kids. I was all LULWUT. Seriously, like kids. Because you have to let them 'manipulate you' into them doing the right thing.
She gave me an example of a prisoner who was spending the week in his cell (yep, thought grounded too!!) they wanted him to talk about a fght that had broken out. When he eventually demanded a book in exchange for info, he thinks he's getting what he wants when in reality they have no problem giving it to him.
They actually do take luxuries away. It's what they do before they put them in isolation. (Which, sorry to disappoint is not that bad. The room depends on the level of prisoner. The worst one is a padded cell with a nailed down bed.)
So they can take away your right to watch a movie and then give it back in order to obtain good behaviour.
If we took these away from prisoners, the only sense of control they had left, can you get more of a picture now how dangerous things could get on their quest to prove just how tough they are? And it's already a pretty dangerous bloody job! There are riots.