Many of then joined the project convinced it was the only way to stop the Axis from developing a nuclear bomb, and at least some of them were opposed to it's use by 1945, particularly against civilians. Not really comparable to an apartheid state currently at peace.

Israel is pretty much constantly shelled by rockets. And there are capable state, and quasi-state actors behind that who officially claim they want it to be eliminated.

https://en.m.wikipedia.org/wiki/List_of_Palestinian_rocket_a...

The fact, that majority of its population can enjoy relatively peaceful life is thanks to organizational, and technological superiority of Israeli military. Which depends on work of Israeli engineers whose motivation is therefore exactly the same: do military tech to stop anti-Israeli "Axis".

Would have been great if the yanks had this mentality towards the troubles in Ireland instead of supplying the IRA with weapons and explosives. Moral relativism is always fun.

They are also guilty of deaths by nuclear weapons.

And we've got some quite famous statements from quite a few of them that they knew quite well, and felt the full weight of what they were doing.

I would presume because they weren't sold the idea that what they were doing had any other express intent-purpose or plausible outcome for use even used by the people they worked for, which alone I think warrants a different group to compare this situation to.