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I mean, no matter what backstory Okaya has, there is no justification for what he did and still does. People out there really believe evil can't be born? This is just a manga but there are a lot of kids who have loving families, no complications at all and they are just... pure evil. With no reason whatsoever. They hurt and kill only for their own amusement, it wouldn't surprise me if Okaya is just the spawn of Satan just for the sake of it.