The thug's vicious attack on a sitting high school girl is the extreme example of a systematic repression imposed in US public schools generally. Any student can be punished or suspended for minor or even fantasy "wrongs", but black students generally face worse treatment.

Suspension from school is extremely frequent: high schools suspend, each year, almost as many students as they graduate. Smaller punishments are probably far more frequent.

This system resembles a training program for living in an occupied country, and students could understand it as such. The thugs in the schools are soldiers in the occupying army, and the school officials are the local collaborators, quislings (that's why they order quizzes).

The teachers are mostly sincere, trying to provide what education they can under the occupation which they cannot defy, but that is easier said than done.

The goal is to make trouble for the occupation without letting the soldiers figure out who did it or how.