Yes. He was mentally damaged. And the damage, as in several other mass shootings, was very likely exacerbated by years of violent videogaming. Anyway, that's why a serious investigation of the link between videogames and violent behavior is a good idea.
BTW, most commenters on this site love to hate religion. But, as Dawkin idolaters, they're more fanatic than most ultra-(choose your religion) monks. At least monks usually make a vow silence.
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