Urban, I think the important thing there is that, in the first link, their point was NOT that violent video games cause violent behaviour, but rather that they may contribute to the larger problem of feeling disconnected from society, people, and reality. In fact, the clip in the Kotaku link doesn't even specify violent video games, but video games as a whole. The article title is misleading.
As for the second link, that's one of the problems with people wanting to be so hasty to judge and act and rectify. Also, what happened on facebook was just fucking stupid and irresponsible, obviously, and makes me hate people. I quite like the comment, "Complete idiots! We might as well shave our heads because he had hair!" Spot on.