Most Americans are not aware that the US prison population has tripled over the past two decades, nor that the US has the highest rate of incarceration in the industrialized world. Despite these facts, politicians from across the ideological spectrum continue to campaign on "law and order" platforms and to propose "three strikes"--and even "two strikes"--sentencing laws. Why is this the case? How have crime, drugs, and delinquency come to be such...