If you do a google search on bullying and related matters, you will find plenty. There are even organizations and programs to prevent bullying. School personnel who claim that they cannot do anything ought to know better; there is plenty of helpful information available.
When forced to do something, somehow they find that they can.
There have been well-publicized cases in which victims of bullying have taken weapons to school and killed many students and teachers. That seems to have got the attention of school authorities in some areas. They may not care what happens to bullied students, but they do care when the school suffers consequences which result in international publicity.
When I was bullied at a boarding school during my junior and senior years, I felt helpless to do anything about it. My first roommate even attempted to bully me sexually. He tried "grooming" me by stating that at another boarding school, the juniors had to give the seniors their "blow jobs;" I saw through that immediately. He was not successful in getting me to give him a "blow job." By some ruse, he got a sophomore into the room and attempted to force him to give a "blow job." The kid was almost crying and, when I saw that he couldn't deal with it, I got up from my desk, put my hand on the door knob, and said, "Tom, this has gone far enough." That stopped it; obviously he couldn't continue if I opened the door.
My fear was that if I reported that sort of thing, I could have been accused of something; it would have been his word against mine. And, I didn't dare tell my parents; that also could have backfired. I did manage to change rooms, which helped, but still there were other problems which at that time in my life I could not handle adequately.
As a result of my experiences at a boarding school, I strongly advise parents NOT to send their kids to a boarding school below the college level. Too many bad things can happen and the parents may never know about them. If, for some reason there is no reasonable alternative to a boarding school, then parents should make sure that they can communicate well with their kids and that the kids will feel free to tell their parents about anything that disturbs them.