Abu Ghraib was no aberration, the recent pissing on corpses was no exception, and neither was last week's murder spree. quite the opposite, they are not only part of a larger culture developing in these places, incidents like this reveal the very essence of US ideology which drives foreign policy, they uncover the precise nature of these wars, of the real underlying American sentiment toward these wars, toward the people who have been constructed as enemies.
Bush jr. was unjustly criticized at the time for his use of words, because they were extremely accurate: "crusade". That's exactly what it always was: a civilizing mission to bring the light of Freedom and Democracy to uncultured primitives who are so backward that they are barely human.
With rhetoric like this as justification and guidance, no one should be surprised if a few occasional stories, out of no doubt tens of thousands, should surface.