Is there such a thing as pure evil in the world? How should we confront evil? Can evil ever be finally overcome? If the universe was created by a supremely good, supremely powerful, supremely loving deity, why is there evil in the world to begin with? On the other hand, if there is no God and everything is permitted, what distinguishes the truly evil from the purely good? John and Ken weigh good and evil with Peter van Inwagen from the University of Notre Dame.