The genius of the current caste system, and what most distinguishes it from its predecessors, is that it appears voluntary. People choose to commit crimes, and that's why they are locked up or locked out, we are told. This feature makes the politics of responsibility particularly tempting, as it appears the system can be avoided with good behavior. But herein lies the trap. All people make mistakes. All of us are sinners. All of us are criminals. All of us violate the law at some point in our lives. In fact, if the worst thing you have ever done is speed ten miles over the speed limit on the freeway, you have put yourself and others at more risk of harm than someone smoking marijuana in the privacy of his or her living room. Yet there are people in the United States serving life sentences for first-time drug offenses, something virtually unheard of anywhere else in the world.