Why not elsewhere? (Score 0, Troll)

What I'm wondering about is why school massacres seem to be such an American phenomenon. I just looked up previous school massacres on Wikipedia (http://en.wikipedia.org/wiki/School_shootings), and a little down the page there's a little list of school massacres (I don't know how comprehensive this is), in which most of the incidents happened in the USA or Canada. The school shootings taking place in other parts of the world seem to have more of a political context (Middle East, Chechenya, etc.) than the ones happening in America. So, why does this happen so much more in the US than other parts of the world? I would think the gun laws of the USA are a a big part of it, but the answer probably is much more multifaceted than that.