Hmm do you have some sources? That sounds interesting. Obviously there’s always doubt, but yeah I was under the impression everyone at the Manhattan project truly believed that the Axis powers were objectively evil, so any action is justified. Obviously that sorta thinking falls apart on deeper analysis, but it’s very common during full war, no?
EDIT: tried to take the onus off you, but as usual history is more complicated than I expected. Clearly I know nothing because I had no idea of the scope:
At its peak, it employed over 125,000 direct staff members, and probably a larger number of additional people were involved through the subcontracted labor that fed raw resources into the project. Because of the high rate of labor turnover on the project, some 500,000 Americans worked on some aspect of the sprawling Manhattan Project, almost 1% of the entire US civilian labor force during World War II.
Sooo unless you choose an arbitrary group of scientists, it seems hard. I haven’t seen Oppenheimer but I understand it carries on the narrative that he “focused on the science” until the end of the war when his conscience took over. I’ll mostly look into that…
If you really think you're fighting evil in a war for global domination, it's easy to justify to yourself that it's important you have the weapons before they do. Even if you don't think you're fighting evil; you'd still want to develop the weapons before your enemies so it won't be used against you and threaten your way of life.
I'm not taking a stance here, but it's easy to see why many Americans believed developing the atomic bomb was a net positive at least for Americans, and depending on how you interpret it even the world.
In this note: HIGHLY recommend “Rigor of Angels”, which (in part) details Heisenbergs life and his moral qualms about building a bomb. He just wanted to be left alone and perfect his science, and it’s really interesting to see how such a laudable motivation can be turned to such deplorable, unforgivable (IMO) ends.
Long story short they claim they thought the bomb was impossible, but it was still a large matter of concern for him as he worked on nuclear power. The most interesting tidbit was that Heisenberg was in a small way responsible for (west) Germany’s ongoing ban on nuclear weapons, which is a slight redemption arc.
Heisenberg makes you think, doesn't he? As the developer of Hitler's bomb, which never was a realistic thing to begin with, he never employed slave labour for example. Nor was any of his stuff used during warfare. And still, he is seen by some as some tragic figure, at worst as man behind Hitler's bomb.
Wernher vin Braun on the other hand got lauded for his contribution to space exploration. His development of the V2 and his use of slave labour in building them was somehow just a minor disgression for the, ultimately under US leadership, greater good.
I think they thought it would be far better that America developed the bomb than Nazis Germany, and the Allies needed to do whatever it too to stop Hitler, even if that did mean using nuclear bombs.
Japan and the Soviet Union were more complicated issues for some of the scientists. But that's what happens with warfare. You develop new weapons, and they aren't just used for one enemy.
EDIT: tried to take the onus off you, but as usual history is more complicated than I expected. Clearly I know nothing because I had no idea of the scope:
Sooo unless you choose an arbitrary group of scientists, it seems hard. I haven’t seen Oppenheimer but I understand it carries on the narrative that he “focused on the science” until the end of the war when his conscience took over. I’ll mostly look into that…