One of the things that happens is similar to the group psychology of hazing. A person perceives abuse as much worse than the person that deals it out. Hazing i

One of the things that happens is similar to the group psychology of hazing. A person perceives abuse as much worse than the person that deals it out. Hazing is the person being abused then delivering worse punishment than they received to the next round of people, again because their perception of the original hazing abuse was worse than what their abusers perceived. School tolerance of abuse/bullying is essentially this hazing cycle occurring over generations, more slowly. That's not the only fucked up human psychology loop in play. Denial, stockholm syndrome, and of course, laziness all come into play.