As someone who has been teaching teenagers for over twenty years, I know that someone, if not several people, at that high school had to know what was going on, but chose not to see. It's easy to do, since teachers are all so overworked and pressured these days. But that's no excuse. Teenagers can be a tough bunch, but it's also pretty easy to read them.
Bullying is a serious social problem. According to the National School Safety Center, one in seven children becomes a victim of bullying at school. Wake up, schools! Getting good test scores is nice; saving lives is crucial.
And they wonder why so many parents choose not to entrust their children to these uncaring public schools.