media violence

Why do news media mangle these issues in sensationalist ways? For one thing, I suspect they didn't bother to read the actual article. But again, I also think it does harken to the emotionally-laden yet nebulous way desensitization is used and misused in the general public.
Put simply, the study's findings provide very little convincing reason to believe there's much of a link, but the author appears to over-interpret weak and inconsistent results in ways I would consider to be irresponsible.
Whether exposure to television violence contributes to antisocial behavior has been an issue of significant controversy for almost five decades. Some studies find evidence for effects, other studies don't, and there is much debate among scholars regarding the meaningfulness and quality of the studies on both sides
Scholars and the general public continue to debate whether media violence does or does not contribute to aggression or violence in society. As part of that debate, it's not uncommon to hear arguments about whether a scholarly consensus exists on the issue of media violence.
As far as we know, Rodger was not "obsessed with" or "addicted to" a particular media product. He didn't need to be; just being a "normal" kid exposed him to repeated stories about violence, aggression, and dominance. It is not surprising that his reaction to personal frustrations was to act aggressively; he'd seen it done so many times.