It's probably true, at least the site the story is on looks reliable. I guess it's just a case of bad journalism. The whole article is a little over-dramatized, maybe the journalist should write some fiction instead.

Video Games will always be the black sheep, media blows it up every time it happens. But I guess they may be right. If I'm ever going to snap and kill everyone, it's going to be because they sell buns in packs of 8 and hot dogs in packs of 10 and not because of stupid video games.