I was going to write "Just hit them with the broom" but I guess a baseball bat is fine too. To be honest I am surprised this does not happen more often IN japan seeing how intense bullying can be over there.
Well...it actually does happen often here.
As a matter of fact, cruel violence is so common that most people here are desensitized to it. You just don’t hear about it unless you pay attention to local Japanese news. The news doesnt talk about bullying or domestic abuse or any of that...its a perverse form of Yellow Journalism (in of itself a perverse form of journalism) that emphasizes the results but not the means. People being cut up and tragically murdered and mutilated is more common than you would like.
I think the story is half playing off that, and half an interesting twist of your typical yandere. I dont think its trying to condone the actions, but rather illuminate something scary about human nature in how people can find an aspect satisfying in it. Also sort of getting at what is good about Yanderes in a backwards and cruel way...at the end of the day they do just really love you, and loving them in kind brings a...happy end I guess.