Were the bombs of Hiroshima and Nagasaki morally justified?

[Antonio the Sixth]

Nuclear weapons did not cause the relative peace of postwar society.

Not by themselves (monocausality is for simpletons), but their existence certainly played a role in preventing a WW3.

Yes. As poorly as this reflects on human nature, it's hard to deny that we would have seen many more wars if it wasn't for nuclear weapons.

[Antonio the Sixth]

As for the OP, no, it was not morally justified, even though it might have been the least worst choice.

[Antonio the Sixth]

I think - and this may be an extension of bias stemming from my political roots - the net danger from nuclear programs in regards to sabotage, accidents, errors and encouraged proliferation far outweighs the supposed benefits of "nuclear peace".

Well, that's extremely hard to find out - and let's hope we never do.