You know how women often don’t report sexual harassment and assault? It’s because if they do report it, they will suffer further victimization and their chances at any just outcome are too low.
Same thing with bullying in schools. Kids don’t report it because if they do so, they will be opening themselves up to further victimization, and the people they report it to will not take sufficient action to stop it.
All schools need to do is make it safe to report bullying, prioritizing the victim’s safety. Then with a report they don’t need blanket surveillance, they can just do targeted surveillance to verify the reports. Once verified, they should take immediate action to put a permanent stop to it.