"You should never touch another child, unless you are saving him from harm." Or unless that kid is physically attacking your child. I've put my hands on a kid who had my child in a chokehold. (My daughter was two, the kid was about 6.) I never had the chance to confront the kid's mother or father, because as soon as I let him go, he ran off. I'm not even sure he had a parent with him. I would have LOVED to have a chat with them about their aggressive kid.