Why was it necessary to drop the atomic bomb to stop the war against the Japanese?

Opponents of President Truman’s decision to use the atomic bomb argue that racism played an important role in the decision; that had the bomb been ready in time it never would have been used against Germany. All of America’s enemies were stereotyped and caricatured in home front propaganda, but there was a clear difference in the nature of that propaganda.  Although there were crude references to Germans as “krauts,” and Italians as “Tonies” or “spaghettis,” the vast majority of ridicule was directed at their political leadership.  Hitler, Nazis, and Italy’s Mussolini were routinely caricatured, but the German and Italian people weren’t. By contrast, anti-Japanese racism in American society targeted the Japanese as a race of people, and demonstrated a level of hatred comparable with Nazi anti-Jewish propaganda.  The Japanese were universally caricatured as having huge buck teeth, massive fangs dripping with saliva, and monstrous thick glasses through which they leered with squinty eyes. They were further dehumanized as being snakes, cockroaches, and rats, and their entire culture was mocked, including language, customs, and religious beliefs. Anti-Japanese imagery was everywhere—in Bugs Bunny cartoons, popular music, post cards, children’s toys, magazine advertisements, and in a wide array of novelty items ranging from ash trays to “Jap Hunting License” buttons.  Even Tarzan, in one of the last novels written by his creator Edgar Rice Burroughs, spent time in the Pacific hunting and killing Japs.  Numerous songs advocated killing all Japanese.  The popular novelty hit, “Remember Pearl Harbor” by Carson Robison, for example, urges Americans to “wipe the Jap from the map.”  It continues:

Explanation:

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He would most likely post his laws in the city market