Responses

Well you see not everybody is smart and they try to show their sensibility in the most stupidest way, in short these ppl pretend to stand on a high moral ground thinking they're doing something meaningful but forget to understand things completely n that how hollow their arguments sound, you'll come across many peeps here holding a beacon of justice which is doing nothing.
I wonder if some people know how to read, they don't seem to have noticed the "horror, psychological", books of this genre will obviously address many absurd and even heavy subjects, regardless of the genre the criminal focuses on or the motives. It's like those people who see a VILLAIN commit a crime against a idk in a movie and question why he hurt that X. He's a villain, his job is to be hated. Reading a work of this genre and understanding it is one thing, another is romanticizing it like some sick people did with killing stalking.
If it's not a genre you like, avoid it and look for calmer things that you like. I like works of this content, i have a preference for psychological horror and i like to see how the villain of the story developed like the one in this manga. He's bad not because he has a trauma that will make almost a multitude of people forgive him, but he's bad because of something in his nature. He was born to be a cruel asshole and son of a bitch.