I think the holocaust, the slave trade, the post-feudal monarchy, colonialism, the cold war, imperialism and third world exploitation justifies the history of communist resistance against a world liberal military hegemony.
My work in communist parties have mainly involved writing literature, educating youth, and feeding the homeless. You can call that revenge, but at the end of the day, I'm the one getting them off the streets, whilst teachers such as yourself serve as the first culling mechanism in deciding who ends up there in the first place.
So you'll have to forgive me if your morality theatrics fall on deaf ears. I'm not some liberal authority figure who sees personal moral failures as some kind of cause to do violence unto others, that's your John Stuart Mill doctrine, not mine. I'm far more concerned with helping your victims than I am at punishing you.
I think the best revenge is seeing these people prosper, and find value and dignity in their lives as real human beings, as you have to see for yourself how your little grading systems and zero tolerance policies set kids up to fail in cruel and unjustified ways. I want show people like you precisely what you set out to ruin in others, and let your conscience punish you in ways beyond the primitive corporeal measures you exact.