He did the right thing, why are you still asking why? I really don't see any difference in what this kid did and what the kid in your story did.
Maybe he's just a right ass
What the heck is that suppose to mean? I would love to see how you react if you daughter accidently left a knife in her purse and got expelled.
Pro-noun trouble -- it seems I was not clear, my apologies for causing your confusion.