Dude looks like he played football. He could have easily just arm tackled the little girl. He didn't have to knock the living $#it out of her but the girl was clearly in the wrong.
It also looked like the girl was attacking an old lady and quite frankly that would make me angry if I saw it in public too. That's probably why he did it, not saying it was justified just saying I think that was the motive. Kind of a "Why don't you pick on someone much bigger than you with a gun?"
The individual who refuses to defend his rights when called by his Government, deserves to be a slave, and must be punished as an enemy of his country and friend to her foe. - Andrew Jackson