DrClapeyron said:
There are at least two needs to drop the bomb in your own argument.
Can you provide a plan the allies may have used to end the war with Japan within two weeks time before dropping the bomb?
Given that the atomic bomb plan was highly secret, even to high-placed military commanders, they had of course plans, and they were in fact executing them. The main idea was to burn out about all Japanese cities, which were also the main support for the Japanese war effort, and to demoralise completely the Japanese. This was in fact working. It was in fact working so much, that orders were issued to the military NOT to damage certain cities which had to be saved to try the bomb onto: a burned-out city wouldn't show the actual damage potential of a nuke (which was unknown at the time!). In fact, some cities were not considered for nuking because they were already too much burned out by conventional fire bombing. The B29/B44 were mainly designed for this continued burning out of Japanese cities.
In the environment of the emperor, in fact, surrender was being discussed. What blocked was the - to the Japanese inacceptable - clause of "unconditional surrender", which was considered too much of an insult, but even that was being considered by the emperor: he only had a few hard-line military which didn't want to take that insult. There is btw a discussion about this single word, which some think Truman expressly put in. A symbolic "non-unconditional" surrender (which actually took place), such as leaving the emperor in place or something would have been accepted immediately by the Japanese.
So Japan was in any case totally destroyed in the summer of 1945, and the military estimated that it could hold out at most 6 months or a year. The war would have been over then. But Stalin was ready to go in earlier, and that wouldn't have suited Truman. So if the Americans wanted to claim victory alone over Japan, they had the options:
- go in with a land invasion, with very high casualty rate
- drop atomic bombs.
If the sole aim was to have Japan surrender sooner or later they could:
- just retract the word "unconditional"
- or go on bombing classically for a few more months, while the Soviets would do the cleaning up. The victory would then be Stalin's.
So yes, there were good geopolitical reasons to drop the bombs. But its aim was not, as is often claimed, to stop WWII. It would have stopped in any case.