It was disrespectful and moderately violent, but hardly worthy of prison time.
I agree with the judge.
Aside from that, the principal should have knocked the kid out after he was hit.
Used to be that fist fights weren't even considered worthy of the police's time.
You're OK with this disgraceful judge's slap on the wrist and you don't think ASSAULT by a 19-year old punk on a school official performing his job should be prosecuted as a criminal offense? Really?