Before he made the decision to drop the bombs he was handed a note with the expected casualties for an invasion of Japan:
The decision was good.
I’d really hate to have been Truman.
It was the Devil’s Alternative either way. You drop the bomb, hundreds of thousands die. You do nothing, Millions die.
Not only was Truman told of the atrocious casualty projections but the Joint Chiefs forcast a ferocious war for the conquest of Japan that would’ve taken into the 1970’s to accomplish.My USMC Dad told me that The choices were thousands of casualties or millions of casualties,there was never any third option.