What was one reason why some Americans disagreed with Truman's decision to use the atomic bombs on Japan?

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They saw the atomic bombs as an unnecessary expense during a time of economic prosperity.
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They believed the bombs would lead to an immediate invasion of the United States by Japanese forces.
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They argued that the bombs killed tens of thousands of innocent Japanese civilians and destroyed their cities.
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They were concerned that using the bombs would prevent the U.S. from being allowed to join the United Nations.
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1 answer

One reason why some Americans disagreed with Truman's decision to use the atomic bombs on Japan was that they argued the bombs killed tens of thousands of innocent Japanese civilians and destroyed their cities. This humanitarian concern raised ethical questions about the use of such devastating weapons in warfare.