Watched this Nova episode on spree killers
http://video.pbs.org/video/2332614200?starttime=117000
While it talked about specifically shooters within the US,
reminded me of a quote by German sociologist Wilhelm Heitmeyer after a spree murder in a Dutch mall a couple of years ago.
Among young people who resort to violence, there exists an intense desire to regain control over their own lives. For years they've asked themselves who needed them, where they belonged, but they received no answers to those for them very important questions. In such circumstances, shooting people in public can give a wonderful feeling of power and self-confidence, because you become the one with the power to decide who lives and who dies. And then you accept the less heroic moment--dying between the checkout lines of a supermarket--into the bargain.
Yes it was discussed here
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=118x401308
One kid said he bought a gun for sixty bucks. He didn't get it from a straw purchaser, gun show, or flea market. Neither did the guy he bought it from.