I disagree he went through it fully and completely messed up his main aggressor's life one by one. The rest got some karma but the main guy had it the worst. I feel like you misunderstood something him bullying the daughter would be out of character! He has litteraly stopped bullying at the past schools he was a teacher at. If you want something like senseless violence go look at redo of a healer.
No yeah, I get that this is the conclusion the plot needed because that's how it builds itself, towards the whole forgiving and giving the chance to ppl to become better. The ending is what it has to be.
But like, he himself admits he wanted to go through it in the start but realized the girl was nothing like the father and couldn't be bad to her. So he changed his plan and exacted a vengeance accordingly. That's fine, that's like, a good job from the author, but that also mean that the original vibes early on of this being a more dark story were intentional, so I truly feel like I was mislead by the first chapters.
I do think tho, that he let the bullying at the previous school go much much further. And we don't know if that was just his morals as a person or if that was the kid of one of his previous bullies, and assuming it is the first, you'd think he'd be worse to someone related to somebody who caused him so much pain.
Also, the fact that he enables and encourages the bullies and even create situations for people who aren't bullies to fall victim of peer pressure or to feel betrayed (and want to betray back too), all of this shows his character. So I wouldn't say that it would be entirely out of character for him to push her further down before doing his knight in chiming armor stunt.
As a suspense with psychological traits, the plot twist was well done, but as a psychological story with revenge plot, it felt lackluster, considering the expectations raised at the beginning.
Tbh, I think I didn't even want violence per se, I just felt a lack of a climax, even if it fit best the story till that point. (and now I'm rambling, mind me not)
The R word is a slur originated to describe people with a specific set of disabilities (intellectual). It's no longer a medical term for its offensive nature but it's still used against thdm or to equate other people with them as an offense (like people do with the f slur).
Most society sadly still don't treat ableism seriously enough so it's not equated with other prejudices (so people who wouldn't say the n word or the f slur still feel comfortable using the R slur).
Kinda disappointed that he backpedaled on bullying the bully's daughter. He fucked up the guy from the previous school but was soft on that Mary Sue?? Like, wtf?? What was the point of letting her be mildly bullied if he was going to take revenge on the bullies? He just made her into bait. Like, you put food on the dinner table and punish whoever eats it, ffs, he could've stopped the bullying from the very root of it. His approach was pathetic
Where's the rage, the anger, the fucked up feelings, let people's revenge be evil!!! Victims already have to forgive forget irl, let them go batshit crazy in fiction, no need for morals within it, everything and everyone is fair game