It's funny that we never achieved unconditional surrender---even after dropping the bombs. Too bad we didn't try to negotiate (and I don't mean issue a vague ultimatum) before killing so many innocents.
Alternatives to bombing:
*Demonstration:
Advantages: would still start the Cold War with the US on top, less death
This approach might have failed to produce surrender, but I think combined with Russia entering the war and the devestation that we already did (the REAL debate should be if firebombings like we did in Tokyo and Dresden were justified) that they might have accepted the terms we finally agreed to (Emperor = immune from war trials and what not).
Even if the demo failed, we could've moved on with Hiroshima.
* We could've dropped just one bomb.
Nagasaki was NOT ordered direclty by Truman. He issued an order to release more bombs as they became available and Groves accelerated the production of the plutonium bomb. Some say that Nagasaki was even a bit of a surprise to Truman himself. Three days was NOT enough time.
The problem is that the bombings are so linked together that it seems that if one was justified, so was the other. Only one person on this thread has tried to distinguish between the two bombings other than myself (or so I think, apologies to anyone I missed). Also, as someone mentioned, our American history classes teach a lot of misleading facts. The government controlled public discourse on the bombings for a good deal of time until things became assumed. There was a time when the effect of radiation was heavily disputed---this was a tactic to make the atomic bomb seem coventional, to link it to the justification of the firebombings.
The death estimate that Truman referred to often kept rising till his death, there's a reason for that. It's high time we at least rethought our assumptions on this issue. Too much Cold War propaganda has been asserted as truth. Look, Hiroshima and/or Nagasaki may be justified, but it's really good to see it debated before that conclusion is made. This thread rocks.
Aside from the fact that I think revenge is a slippery slope when hate of the Japanese and wish to preserve peace by fighting a dangerous enemy is blurred... we sure got those damn japs when we burned the flesh of children and locked up the spies on our own territory, etc.
But it's interesting you use that example. There's a lot of interesting analysis related to how FDR provoked Pearl Harbor, awakening a sleeping giant... eh? I'd rather save that debate for another time though. I work in the morning.