"I just don't want people to think that he's this vicious individual. He's got mental issues," his father said.

Uh, sorry dad - I know parents never want to face this, but your son IS A VICIOUS INDIVIDUAL. He was punching defenseless seniors who did nothing to him. He clearly planned it as he filmed himself, and he waited until no one else was around to do it. He's a PREDATOR.

I do feel bad for parents in this situation, but they really do have to start being honest with themselves and people around them. His son is a danger to society.