Why don't we hear more about people flying planes into buildings in China? Or students (or even teachers!) losing it and shooting up their schools?
Is it just that they have better control of their media (so we don't hear about it), better control of the people (so they don't get a chance to do it), or something else?
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.)
Is it just that they have better control of their media (so we don't hear about it), better control of the people (so they don't get a chance to do it), or something else?