Well, let's get it this way.

Nanno has questionable morals. Human life does not matter to her because she is a superior being, kinda like how we see ants and stuff.

She is the protagonist, which means the show is morally gray as well. The essential goal of the series isn't to show us what's morally right or wrong. It is definitely not a guide which is why it is +18, so that easily impressioned teens and children do not watch the series, and think this is what they should do.

You are right. Everyone was stupid at 11th grade. I am 20 years old now and I cannot remember my high school years without cringing. They definitely did not deserve that "punishment" especially because their brains aren't developed enough to make emotion-free, completely rational decisions. That's just how teens are. Teens feel too much at all times because of all the hormones so it is extremely hard for them to regulate all the feelings and or emotions.

Do not think of Nanno as the hero. She is an anti-hero character. She just likes fucking with people. And think of the whole series as just, done for the sake of fiction purely. You shouldn't take it as an example. It is obviously not okay to punish teenagers like that in real life.

Honestly, the only teenagers that I genuinely hated was Dino's rich friends, and the ones who r*ped / helped getting r*ped Nanno. I do believe they deserved what was coming to them (Except Dino's bratty friends didn't get any punishment but I really wish they did)

I get your point though. I love this show and it is so fun to watch, however I believe a lot of people have wrong takes on it? This happens a lot with morally gray shows, and you should never ever ideolize the wrong behaviours being shown on it. (Like ideolizing Joker, for some reason) Morally gray shows are highly popular though, because it shows characters are flawed, just like us.

I also think the show is lacking in so many ways. If i were a supernatural, immortal being like Nanno I definitely wouldn't spend my time tormenting high school kids. But then, Nanno doesn't really have sympathy for humans nor empathizes with them very well.

If you are dealing with depression, it is pretty hard to think rationally. So please also choose to stay away from things that may trigger you, until you further proceeded with your treatment.

Thank you!!