Truman’s decision to use the nuclear weapon saved countless American lives.
It was the right decision. I do not give a damn about any Japaneese lives lost as a result.
It actually saved Japanese lives, considering their casualties would have been massive given a US land invasion of Japan.
Another fact that is glossed over, is that had the war dragged on, the Soviets would have been involved, and Japan would have wound up being divided, just like Germany and Korea, and it would have been another Cold War hotspot.