To play devil's advocate a moment, why should international politics be mandatory?
I know about the genocide in Darfur, but I can't do a thing to change it. All it does is make me unhappy. Same for problems in the middle east, the torture of monks in Burma, China's ethnic cleansing of Tibetians, etc.
There's nothing I can do about any of those things. Awareness is pretty much irrelevant on an individual level. There's really no reason for people to step outside their 'bubble' because even if they did, it wouldn't matter and it wouldn't change anything.