Hernandez is an actual psychopathic killer and I don't think it's really fair to compare other people to him, besides other psychopathic killers.
I don't think it's THAT much of a stretch to say Rolando could have been that hothead killer though if he kept flying down the wrong path. I mean the guy was convicted of assaulting someone and shooting a gun right next to their head. It was later appealed and the case was dropped after the victim got a cash settlement and decided not to press more charges, but it's not that huge of a stretch to think the guy could have gotten in a fight and shot at someone the next time.
I didn't like the guy as a player when he was on the Raiders, but I'm glad he's made positive steps in his life since then to be a more stable person.