Also because schools like to claim that they are bully free. Actually addressing bullying problems is hard, but sweeping incidents under the rug is extremely easy.
When my oldest son was in the third grade, a kid jumped in front of him in line (ironically going to an anti-bullying assembly). My son put his hands up to his face since the kid was so close to him. The kid then kicked my son in the side so hard that he left a shoe print on my son’s side.
The next day I had a meeting with the teacher, assistant teacher, and the principal about the incident. First, they told me that nobody saw what happened. Then, they told me that my son started it by putting his hands up to protect his face. Finally, the principal told me that my son “isn’t the type of kid to be bullied.”
At that point, I knew I wouldn’t get anywhere with them. They were trying to sweep the whole thing under the rug so they wouldn’t need to deal with it. I left the meeting and my wife and I pulled our child from that school. We contacted the superintendent and raised a fuss until they agreed to put our son in another school. (He did a lot better there and now is thriving in college.)