Some people just act that way.  It's not that they necessarily have anything wrong with them.  It's just who they are.  They're bad people.  You can't fix them.  It's sometimes hard to accept.  If this guy wasn't morbidly obese, just imagine all the horrible shit he'd be doing.  In a weird way, it's two wrongs making a right. Oh, and I think he is on drugs.  Prescription drugs.  I believe he said he takes percocets.  That's got oxycodone in it, which is a an opiate narcotic like heroin and morphine.  I'm pretty sure that becoming an evil piece of shit isn't one of the side effects.