"Kids just being kids" is a BS answer in EVERY case. As human beings, we have a moral compass. Don't tell me these kids don't know what they are doing is wrong. I don't have kids of my own, but am known for defending my family and friends. I was out with friends and this guy kept banging into my friend and just generally rude. About the fourth time, I got in front of him and pushed him against the wall and said "If you don't STOP it, you'll regret it." My friends died laughing cause I'm 5'2" and the guy was over six feet.
Good for this dad for standing up for his daughter. That's his JOB!