We are still surprised by evil. From Auschwitz to the events of September 11, we have been shocked into recognizing the startling capacity for evil within the human heart. We now know 9/11 revealed that our country was unprepared in terms of national security, but it also showed we were intellectually and morally unprepared to deal with such a barbaric act. Our language to describe evil and our ethical will to resist it have grown uncertain and confused...