It is wrong he pushed the girl. He should have assaulted the inattentive parent.
I just watched it again. He is completely justified. She was coming at him.
These kids did not step out of a Leave it to Beaver episode. They stepped out of one of those post-apocalyptic movies. They don’t think like you and me. They are dangerous. We are domesticated dogs. They are coyotes. You assume them to be domesticated at your peril.