I don't get the parents who don't agree to this. I mean sure your kid's going to get hurt but babe, they fight all the time and bully each other, what's wrong with hurting a bit more from a grown-up? Maybe educate your kid more and teach them to treat each other nicely so they won't get fucked up. I mean the guy only takes action when he sees shit going down, he won't suddenly attack some random kid.
I HOPE THE GRANDPA ISN'T DEAD, I'D CRY IF HE IS.