Whether hoodlum or Eagle Scout, it's fair to say that if students were, say, greeted by a huge billboard outlining every detail regarding the legality of potential weapons, the searches that may be undertaken to confiscate them, etc., then I don't think anyone has as much of a beef with this issue. Maybe every student DOES have a copy of all of the school policies, given to them on day one. I just haven't read anything to that effect.
One can say "ignorance of the law is no excuse", but assuming he wasn't aware of the full extent of the policy, then in my opinion, what went down with this kid was unreasonable, given the context. Should he have checked the school's policies before deciding to carry a 2-inch pocket knife in his car? Apparently. But the reality is that most people's sensibilities still haven't caught up with administrative paranoia when it comes to post-9/11 America. Perhaps somewhat perversely, part of me hopes that it never does.
We've been reduced to playing word games in trying to define common sense. A sense of reason has been replaced with "preemptive justice", in an attempt to eliminate the possibility of anything bad ever happening again. As far as I'm concerned, the psychological damage - the knowledge that freedom isn't really all that free, or what's seemingly right isn't as right as you thought it was - may harm this country in the long run more than the "preventive maintenance" being undertaken by law/policy makers.