Along with enraged responses to Zeppelin air raids, the sinking of the Lusitania, and the use of poison gas in the trenches, these demonisations prompted outrage in the United States and other neutral states at the moral vileness of Kaiser Wilhelm's Germany. Bad things were undoubtedly done, but the propaganda technique of encouraging pro-war sentiment in one's own country by claiming that the enemy commits atrocities is both too tempting to resist and too commonplace to ignore. Its effect is to make going to war against a supposed such enemy more acceptable, providing a moral justification and the requisite preparedness to make and accept sacrifices.
( A.C. Grayling )
[ War: An Enquiry ]
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