The mood in 1945 was to get the war over as fast as possible, using any means necessary. We had exactly two bombs. Tough decision.
My dad was on a destroyer 1943-1945, on a radio ship. It was not until after he died that I learned that ‘radio’ included radar. Once we had radar, the war became one-sided.
Note that FDR, in 1944, picked Harry S Truman, an obscure Kansas City machine Senator from Missouri, ditching Vice President Henry Wallace (1941-1945).
Wallace was the Progressive Party candidate for President in 1948, causing Truman to lose a close race to Thomas Dewey. Then the Machine, late on Election Night, in Kansas City and Chicago, flipped the election to Truman.
See also 1960, 1968, 2000, 2016, and 2020.
And yet we have Freepers right here on this thread insisting that the people of this country would have tolerated a massive invasion of Japan with hundreds of thousands of American casualties.
I think there would have been a lot of pressure to impeach Truman and throw him out of office if there hadn’t been such a concerted effort to hide so much of the war from the American public.