This basically happens with every violent incident where any related party has had any contact whatsoever with video games, because they're an easy target, and the moral guardians can painlessly shift the reason to them instead of, lets say, victims personal history and/or potential mental issues.
While there is some evidence to the fact that violent videogames and other media can act as a trigger when a person is already unstable (IIRC), they're hardly responsible for the instabilites themselves, and this is something most accusers seem to miss.
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