It is often said that the Twentieth Century actually began in 1914, the year in which the Great War, the most awful war in many ways in human history, began. As an example of how ghastly this era has been, consider this: given the unspeakable agony and carnage of the Western Front, the Italian Front and the Russian Front in the Great War, and given the unspeakable agony and viciousness of the Holocaust, which should moral and reasonable men have chosen over the other? Reflexively, we assume that the Great War was the lesser evil, but that is primarily because...