During the Cold War, both sides possessed weapons of mass destruction, but neither side used them, deterred by what was known as MAD, mutual assured destruction. Similar constraints have no doubt prevented their use in the confrontation between India and Pakistan. In our own day a new such confrontation seems to be looming between a nuclear-armed Iran and its favourite enemies, named by the late Ayatollah Khomeini as the Great Satan and the Little Satan, i.e., the United States and Israel. Against the U.S. the bombs might be delivered by terrorists, a method having the advantage of bearing no return...