Does it really come as a shock that people prefer to protest the powers that are oppressing them and their friends, rather than the powers that are oppressing someone else on the other side of the planet?
And it's especially predictable with groups such as Anonymous who in their writings come off as pompous, childish, self-centred, and self-aggrandizing. Not the kind of traits that correlate with empathising with people on the other side of the planet.
Their strategy (setting aside the more base stuff that is just bullying and focussing on their attempts to appear principled and 'crusading') seems to be to latch on to easy populist targets in order to win others approval. Their politics are those of angry teenagers who've read enough Chomsky or Klein to get all riled up.
I like to think if we had a good government that we can truly trust, then we can trust it to step out and assist worldwide injustices: land aid to the people fighting an oppressive government, enable communication between the oppressed, prevent the oppressive government from buying weapons, etc.
To be clear, the gp is describing correctly directed anger, so the rest of your post addresses a different (although also important) issue.
http://en.wikipedia.org/wiki/File:US_incarceration_timeline-...