I think it was to end the war quickly before our Allies* or Russia could invade Japan. It would have been a hard fought war, and using the bomb was the right decision. I'm not sure they picked the right places. Kagoshima would have been the more militarily advantageous place to drop the bomb. (Kagoshima is on the very southern part of the island where it was expected the US would land.)
I think it might of also been about getting the Manhattan Project out into the open so they could test more.
*On the Operation Downfall wiki, the US refused UK, Canadian, Australian troops until the second half of the invasion.
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