One of the many many lessons of Abu Ghraib that we refuse to learn is that when you give people no training, no oversight, no consequences, no ethical boundaries, and tell them to get 100% compliance, especially from people they hate, they will become sadistic torturers and murderers. Human beings are not compliant. Anyone who knows about human beings understands this, and most of us face consequences for exercising authority with violence. The police are making little Abu Ghraibs, everywhere.