"Watching his dad almost kill a man." Sound like someone is exaggerating to prove a point. If he wants to take his kid, so what? It's not like it's gonna turn the kid into a psycho. That's like saying letting my kid play left 4 dead will turn them into some crazy gunslinger...
He elbowed & punched the dude's bloody face into the canvas repeatedly....so badly the guy didn't even walk out of the building on his own. He was strapped to a stretcher and carried out by paramedics. Many men have died from less trauma before.