According to the "Supreme Leader" of Iran, Israel is "another dirty page in history which will be closed." Clearly, the problem of bloodthirsty, genocidal evil is more than just a study of past; it is a matter of current events. What is the mental construct that justifies such evil? Why is it so virulent, so persistent throughout human history? Here are 10 constructs of evil thinking. They are also 10 reasons why it is so infectious.