The human predator exhibits an increasingly disturbing presence in our society. Serial killers travel around countries, continents, and the globe murdering anonymously. People kill and maim whole crowds of people with poisons, guns, and explosives. They destroy lives with harrassment, blackmail, and rape. It is difficult to estimate the full impact on society of these predators, but it is clear that this is a great carnage, as the human wreckage which is the result can be seen all around us. Making things worse still is the way people often react to trajedy by attacking the innocent and focusing on unsupported theories of causality.