Jim:
Nuclear weapons have never been considered by any sane nation as a practical, never mind a human method of warfare .

I object to the inference that Winston Churchill, Franklin Delano Roosevelt, and the nations of USA & UK were insane.

Of course you may have meant something entirely different, but I can only respond to what you actually type.

The actions of the Allies may have been wrong in hindsight, but even that is open to debate.