From my experience...
Schools concentrate on education, and how much concentration is placed on education is the difference between different schools and school systems. Schools are schools. They are there for education.
That being said, in light of the events over the past 15 years or so, schools have become more and more strict on their policies and procedures, but this is as a result of society pushing the envelope....maybe not society as a whole, but the bottom-of-the-barrell people who cast a bad light on society. In other words, the few bad apples that ruin the barrell...
So schools have had to react. When I was in the 11th grade, the Columbine shootings happened. As a result of that, our school went into an almost lockdown status. We used to eat lunch in a courtyard, but the school administration decided that we shouldn't be allowed to eat outside, for fear of a sniper, since our school was bordered by wooded areas on 3 of the 4 sides. They employed police officers to stand in each hallway, throughout the day.
So, given that schools have to have more security in light of somewhat recent events, they still have to uphold a reputation. Even public schools. If all the parents decided that they wanted to put their kids in a different school, there wouldn't be a need for a "less desirable" school.
It's almost the same regarding pregnant girls in highschool. There was a big deal a few years back, before I got to highschool, where a girl was in her third trimester when it came time for her to graduate. The school board tried to prevent her from walking, saying that they were concerned that the stress of the graduation ceremony would make her go into labor, but what the real issue was was that they didn't want to be known as a school that allows its students to get pregnant. They viewed it like allowing a pregnant girl to walk with her class, that they were "condoning" teen pregnancy. And in a way, I can see that...but it's doesn't make it fair.
Like someone else posted before, it's a beurocratic response.
The same thing goes for fighting. I think they're looking at the act of fighting more than who's at fault. Even if you're being picked on, and you do nothing to protect yourself, and get beat up, the school board has the right to look into the incident. I think if an unfair judgement is given, it can and should be challenged, even if it goes to court, and a lawyer is required.
But try to look at it from how the school is viewing it, whether their view is right or wrong. It's 99.9% about being politically correct. If there are 2 students that are in an altercation, they don't want to take the time to investigate it. The quickest way to deal with it is to punish all parties involved, and be done with it, and move on to the next item on the agenda.
The problem with that is that it doesn't send out the right message. It's sending the message that you may as well try to beat the crap out of the guy picking on you, since you're going to get in trouble anyway. If they wanted to send a better message, each case should be investiged, and the person or people involved that are responsible for causing the initial incident should be punished.
It should be dealt with on a case by case basis, because not every fight is cut and dry, with one person being the bully and one person being the victim.
Just like anything else in life, there is no one-size-fits-all answer.
Now, regarding the issue of posting on a public forum not going back to the authorities:
I actually had this happen to me, so I know that it's possible:
I was posting comments on a site about martial arts in general, and ninja powers were being debated.
Without getting into particulars about the entire conversation, this is basically what happened:
(other guy): I'm a ninja, and I know how to make myself invisible.
(me): ok, so prove it.
That was the extent of it. Nothing was said to provoke the guy, make him angry, or to cause him to direct his anger toward me. I simply said that I won't believe a claim like that unless I see it. It just so happens that this guy was crazy.
He looked up my ip address using some kind of software, got my information from my ip address, and got my phone number. Then the guy actually called me and left a message on my answering machine at 4 am:
"Hey, I just wanted you to know how easy it is to find you. I know you have a family, and I know how to get to your house. I'm going to use my ninja abilities to kill you and your entire family, and prove to you that I can do what I told you I can do."
So, yeah, I called the cops. They tracked the guy down, but basically gave him a slap on the wrist and told him to never do it again. (He was in Oregon, and I'm in south Ga...the chances of him appearing on my doorstep are pretty slim).
So don't ever assume that just because you post something on a site that it won't come back to haunt you outside of cyberspace.