OK, so this guy was not perfect. In fact, he really seems like a jerk.
I still maintain that United handled this VERY poorly. They should have raised their offer until someone accepted it. Forcibly removing a paying customer from the plane is just wrong. And United will lose a TON of money for having done this. As they should.
From what I have read no United employee manhandled this guy. The police did that. Federal law is if you are told to deplane you have no choice but to get off. This idiot howling and screaming and running back on is ridiculous. Reminds me of the ride lines at Disney......