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When I was a teenager I would pour Coca-Cola into the school computers after seeing a fellow student get into trouble for similar stuff. Never got caught for that. It's acid and worked especially well against powered up electronic equipment.

I wouldn't be surprised nowadays they would just start a rumor about the teacher's sexual misconduct or grooming of the students, in response, instead. And the accusation could spread and escalate, completely destroying the life of the teacher.

A certain percentage of the population will just make stuff up if they have the opportunity to do so, and "juicy" gossip can spread virally. So if they ask for "witnesses" to come forward, they will. Sex offenders are hated so much in society, they get beaten and abused in prison all the time, so it's essentially torture in the end.