@1059212: 3. yup, my bad - there a shit ton of comment said "he'll become a legend in my school" that I mistake your with someone else. I should have read your original comment more carefully, but the wording "We're just saying" in the reply, as well as the fact that 3 out of 4 comments between your reply and mine is about "legendary" gives me the impression that you guys is in the same camp, hence my mistake. sorry about that.
2. and the fact that two teachers making out is HIS business because? he saw them at the school gate (while he himself standing on the 2nd/3rd floor), rushed to the ground floor to follow them, watched them make out and undressing each other, and then started filming at the sex part. I think it's best for us to agree that actively stalking someone and filming their action (and then show it to the whole school) is a creepy as f behavior.
1. i think this is your tarpit: you treat the student body as a united front against the teacher, instead of a collection of many small ingroups that treat other groups as outsiders (with teachers are even further away). Each group has a different relationship with the teacher, with some (like the academic group) try to remain in the teacher good side, some are hostile, and most will just ignore them - they care about dealing with ever-present other student groups, not with the distance teachers.
here is what i think will happen to our "hero", based on my own experience as a highschool guy in an East Asian country.
a. he will receive special attention from the teacher, and everyone will be aware of that. Not only it makes people keeping a safe distance from him (to avoid the teacher's attention), it's more or less greenlit all the bully happen after that.
b. at the same time, some student groups will start considering him to be a creep. It will become worse as the actual information is murky, and they don't exactly know his side of the story, only the fact that he filmed the teacher in secret, and then showed it to the whole school. Rumors started to spread; and since the hero is away for 2 weeks, these rumors could get as crazy as they want to be. More and more groups will move to the "he's a creep"camp.
c. come the bully group. They are ashole in the true sense: they may benefit from you in the past, but if they find an opportunity to put you down to increase their social standing, they will do that. Mind you, by this point, a sizable (not necessary majority) part of the student (especially the girls) somewhat disapproves of the hero's action (thinking that it was too far), so the bullying does have their passive acceptance. The cold shoulder from the teacher, and the fact that everyone else try to practice their social distancing from the hero, meaning he has no one to back him up (or even somewhere to retreat to). He is the perfect target, and with no real pushback, the bullying will escalate.
d. at one point, the bullying will become normal, and the goal post is shifted from "should we approve his action?" to "should we stop bully him to THAT extent?".. a critical mass is achieved, and some neutral actors will join in the bullying trend to increase their own standing, while other will have even more reason to stay away.
e. after a while, the bullying will fall out of trend and die out (through not completely). But by that point, the hero is already an outcast, and no one will break the taboo placed on him.
4. If the deciding factor of whether something is acceptable or not is whether it "entertaining or interesting" for you (and not the motive or the cost inflicted on the parties involved), or the fact that it was inflicted on one specific group of people and not the other, then i think I've really wasted my time with this "argument".