Often times my students ask me what scares me the most. I often respond that nuclear weaponry in the hands of terrorists are what I think the greatest threat to humanity is. But in my heart, I know this is untrue. My greatest fear is not what they can do to us, it is what we can do to them. Save for self-imposed restraint, what is there stopping us from doing unto the entire middle east and beyond what Alexander did to Persia, Rome to Carthage, Europe to the Aztecs and Incas, or even America to the Indians. What is...