It was very moral. Saved many lives on both sides.
The reason the bombs were available to be dropped on Nagasaki and Hiroshima, was because they were not ready in time to drop them on Berlin.
After the two were dropped on Japan, the US had pretty much shot their wad for their nuclear arsenal. There was not enough material to make more for a while, at least several months.
It sure saved my late father-in-laws life. He was a 4th. Division Marine recuperating from a serious leg wound he suffered on Iwo Jima.
He came home, met my late mother-in-law and they married. They had four daughters. One of them is my wife.
If the A bombs failed Lemay was armed and ready to launch an aggressive incendiary bombing program which would have killed MILLIONS.
The reason they were using incendiary devices almost exclusively over Japan was because the air currents from Asia did not allow bombers to accurately drop conventinal HE bombs on target. The AAF went to the incendiary devices because accuracy was out of the question due to prevailing air currents and since much of Japanese industial zones (and the cottage war industries) were in and around cities constructed mostly of lumber, incendiary methods were deemed the most effective.