When we speak to people about communism, especially young people, they often insist that although communism has failed everywhere it’s been tried, the U.S. will be successful in adopting it. They clearly have not learned the lessons of human nature and depravity. And they might be surprised to learn that those attributes exist abundantly in this country. We only need to study Cambodia, one of the most extreme applications of communism ever imposed, to get a hint of what might show up here. Young people in this country have a hard time relating to the Killing Fields, because the main...