You or wouldn't like it, but if he's a psychopath with somewhat higher than average intelligence, a lawless, corrupt prison might be the sort of environment in which he would flourish. Think of Hannibal Lechter, for instance.
A movie? This is for real.
He's a big boy and obviously used to taking force to the ultimate level when he wants to. Add to that that he is a sociopath and he doesn't really care about consequences to himself any more than he does to others.