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Most people who play this kind of games and read this kind of mangas are peaceful and have some intellect. Just because someone is reading MPD Psycho or any other "violent" manga doesn't mean that he or she will start killing everyone they see on streets.
Also, pick the main readers of hentai doujins. Man, they only want "fun" or whatever else, they are not criminals or rapists or anything else like this.

Actually, they should worry about the real mean people.
They don't need any books or games to make them be mean.