On the correlation/causation thing that is mentioned in the article: correlation equals causation only if someone either wants to tell us that correlation IS causation or s/he is paranoid.
Some more recent psychological research that is well designed shows that there is no correlation and actually those in experimental group actually showed reduced violence/anger after playing video games.
It gets to be far too easy to look for one cause in these cases, especially if that cause happens to be one you are already biased against. But I suspect it helps to stave off the sense of fear and helplessness
of random chance. The fact that the universe is truly random and bad stuff happens to people for no other reason than random chance is hard to live with.