i don't mean this to be insulting, but you appear to be completely and utterly divorced from modern day public education.
you're probably somebody who had a decent high school education. i was too. you would probably be just as appalled as i was if you were to sit through one hour of what both my parents have to put up with every day as public high school teachers.
detention? they don't show up. suspension? they keep showing up. usually just to see their friends and piss off the teachers. at some point, if a kid digs in her heels, gets all dubya, and just keeps saying "make me", given that pretty much any kind of punishment by the school is going to be either unenforceable or circumscribed by administration, you have to do something, or else all the other shithead kids see the rules are hollow while the good kids can't get the time and attention from the teachers that they deserve.
parents? they don't give a shit. their attitude here, and a good handful have voiced this explicitly, is that if driving a log truck is good enough for them it should be good enough for their kids. they get angrier at the teacher for calling them in for a conference then they get at the kids for being shitheads. and that's assuming you don't get one of the "my kid's shits don't stink" parents talking about bringing in their lawyer.
administrators? terrified of the superintendent, who in turn is terrified of lawsuits.
and don't even get me started on the "teachers' union" (tm).
the sad fact is that the single biggest element in the public education equation today is lawsuits. spurious ones as well as those with merit. remember, all you lawyer haters out there, many of those lawsuits that helped break public education were completely justified. there have been many, many cases where teachers abused their powers and/or their students.
sadly, the only solution for that problem appears to be creating a new one. in the past, teachers had some wiggle room with discipline, and students had some wiggle room with unruly behavior. no more. everything, on both sides of the fence, is now by the book. and everybody's worse off for it.