Yeah, that's about it. General Patton, John von Neuman were among those advocating for it, and in hindsight I think it would have been a good thing to avoid the Cold War and the communist era, saving China from the horrific Mao era, etc.

But I agree that turning on an ally, sacrificing millions more of your soldiers etc at that point would have been a very hard sell. I'm sure I would have been opposed to it at the time.