Evil that warrants the large-scale killing of war needs a face. But that face cannot belong to some amorphous mass of an enemy population; in fact, it's a ritual for the president to offer assurances that civilians who may be caught in the crossfire are not among the Pentagon's targets. The bull's-eye must be painted on someone who links the nascent war to an indisputably justified one of the past.
For this purpose, Hitler's name has been pressed into service, intermittently, for decades. Pointed mentions of Nazi Germany and the Holocaust open floodgates of emotion, connecting a present-day foe with a regime that slaughtered millions of people near the fulcrum of the twentieth century. What helps to do the trick is the message that while horrors of the past cannot be changed, they can be prevented in the near future.
At a press conference on July 28, 1965, when President Lyndon B. Johnson spoke...
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