A lot of comments in here assuming there wasn’t good reason to restrain the kid. Or that this school exists only to contain kids of parents who can’t be bothered to be there for their kids. That might be true, but it’s just as much of an assumption as the opposite.
My daughter is 10, adopted at 5 from a traumatic past. Last weekend I asked her to do a chore and because she didn’t want to, escalated to assaulting me. Eventually she needed to be restrained because she refused to take simple steps at my suggestion to get herself calmed down and instead attempted to hit, kick, bite, and headbutt me. Maybe you assume this is simply me being a bad parent, but the fact is that I remained calm and only asked her to take the time to calm down with the skills she’s been working on for this kind of thing. The trauma she was exposed to before I adopted her was not my fault, but I have to deal with how that impacts her choices every day. And sometimes that means restraining her, calling the police, or admitting her to residential treatment. None of those are ideal outcomes, but I have to make choices that will keep me, my wife, our son (her biological brother we also adopted), and HER safe. If you had seen the kind of damage she can do, you would also not make the dumbass suggestion to just leave her be; I can assure you, there was not a better option last weekend.
So idk, you could be right: this place could be fucked up and they could’ve had no good reason to restrain this kid. But I don’t think it’s fair to assume that this person deserved to die because they had a teen drop kick them in a school for troubled kids. They were likely doing their best to help this kid and instead got assaulted to death on the job.