Forgive me if I'm wrong, but isn't intervention abroad generally down to what benefits it creates for the intervening parties? Not solely for the interests of the people of a country. (Afghanistan - to prevent terror training camps and destroy poppy fields. Iraq - find *WMD's*, kill a dictator and get more control over oil).
Obviously some sort of U.N sanction should be put in place, but us or the Americans couldn't afford to just go sending people in there to sort out some more mess. Though I'm sure it would be going through some minds if there was some sort of benefit such actions would incur.