It is worth noting that a group of the Manhattan Project scientists signed the Szilárd Petition asking that the bomb not be dropped, or at least that the Japanese be told about the bomb and given the choice to surrender or be blasted to smithereens.

Curiously, Edward Teller, (who later became known for his aggressive advocacy of nuclear weaponry), apparently intended to sign it, and J. Robert Oppenheimer (who later became known for being aggressively anti-nuke) talked him out of it, saying essentially that they'd been hired to develop the bomb, and that its actual use was above their pay-grade.

This, of course, is an iteration of the "Nuremberg Defense"
that was so funny in "The Germans" episode of "Fawlty Towers" and all those Mel Brooks movies.