[eru]

Less guns per citizens (http://en.wikipedia.org/wiki/List_of_countries_by_gun_owners...) and less access to planes?

By the way, there were also some incidence of pupils shooting up their schools in recent years in Germany. I guess you are just much more exposed to American incidents than to the rest of the world. (E.g. have you heard of the whole ugly neo-nazi stuff in east Germany in the 90ies? It still goes on, though at a much lower level of intensity. It's quite hard to find English language sources on the anti-asylum-seekers riots in Hoyerswerda in 1991 but http://www.jstor.org/pss/4146935 is on.)