>>283070349
I wouldn't say menhera is necessarily a nurture versus nature thing, or a product of trauma. In terms of disposition towards harm, that's definitely in Mizuki's court. She's far too reserved to resort to violence on her own impulses. I don't think she viewed scarring Mizuki in return as a punishment in kind or eye-for-an-eye, rather, she felt the laceration was if anything a positive experience for her, and she wanted the same for Mizuki. It was, after all, an act of love, and she did need to be better about reciprocating. Going by Mizuki's reactions after the fact, it seems she agrees. Rather than regret, they both accept that they deviate far from the norm. My answer to who's the more crazy: the crazy or the crazy who follows her, is the latter. Mizuki at least had a moment of good sense to turn herself in and get a restraining order; Sayori is the one who ultimately reframed the whole incident as something good and necessary for their relationship. In general, I suppose I find deranged logic to be more crazy than irrational emotionality.
Like you said, it's a moot point, but I still have to wonder if Mizuki really had a problem with one classmate in particular, and decided a boxcutter was the solution once again, where would Sayori stand on the matter, and whether what holds her back would be cowardice or decency. Admittedly even if the senpai were still in a position to be engaging in such dilemmas, it would be a significant step darker in tone even relative to the existing state of the manga. You're probably right, but the writing has left too much fertile soil for the seed of doubt for me to simply accept that Sayori is a decent albeit crazy person unequivocally, especially because she's so good at faking normalcy.