A book I read a few years back seems relevant to our discussion of the Abu Ghraib cases. Philip Zimbardo (best known for his Stanford Prison Experiment) put out a book, "The Lucifer Effect: Understanding How Good People Turn Evil" after testifying at the trial of Staff Sgt Ivan “Chip” Frederick II, one of the Abu Ghraib defendants. Zimbardo argued the lessons learned from SPE: A bad system produces bad situations in which people act badly without even necessarily knowing why. The court martial rejected his testimony, claiming Abu Ghraib was an aberration. Frederick – an army reservist – was sentenced to eight years’ imprisonment and stripped of nine medals and 22 years’ retirement pay. The standard line on Abu Ghraib held true, "a few rotten apples can taint the whole barrel," bracketing out the possibility of changing the prison structure, the prison situation that Zimbardo tried to argue caused the behavior.
EDIT: Zimbardo's Hero Project centers around the study of the banality of heroism, aiming to be an "international organization to promote heroism as an antidote to evil and as a celebration of what is best in human nature," and "to internalize the perspective, 'That when I become aware of the need to act on behalf of others needing help or being the victim of evil forces, I will be ready and able to take the necessary action.'” If you want to be a Zimbardo "hero-in-waiting," it looks like you can sign up here (looks like Anderson Cooper did!).