On what grounds to Truman‘s critics question his decision?

Critics have charged that Truman's decision was a barbaric act that brought negative long-term consequences to the United States. A new age of nuclear terror led to a dangerous arms race. Some military analysts insist that Japan was on its knees and the bombings were simply unnecessary.

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it was a act of seld fesnse more over it was a peace treaty between the fogein contunries.