I remember this from years ago...They calculated how many American lives would be lost in an invasion and made the right decision.
There’s the fear & horror of atomic weapons as a psychic issue, but in terms of actual decimation of civilian populations, the blanket use of non-nuclear incendiary bombs, in Coventry, Dresden & Tokyo, was far more significant. To our perspective, Truman shouldn’t have used nuclear or atomic weapons, but then, with the extreme militarization of Japan, with every little school child and even babies in prams in effect in the military, it was a modern equivalent of the Spartan militarization of a society. If such a society fails in its primary endeavor, taking over a large part of the world by military action, it sentences itself to death—do or die, still in action as the Japanese people refuse to have children. It was only a technical limitation that the Japanese failed in their effort to bomb the West coast of the United States with bubonic plague bacteria in clay bombs, but one which the Chinese Communist Party and People’s Revolutionary Army learned all too well from Japanese Unit 731’s biological warfare.