Whenever Mark Shea writes about the bombing of Hiroshima and Nagasaki, proportionalist commenters boast of their evil-for-the-sake-of-good moral theories. I find that depressing, particularly on August 6.
"Every act of war directed to the indiscriminate destruction of whole cities or vast areas with their inhabitants is a crime against God and man, which merits firm and unequivocal condemnation."
...cannot be read as a priori condemning every conceivable strategic nuclear attack.
We should have the strongest possible presumption against such attacks, without absolutely ruling them out.
Reading "firm and unequivocal condemnation" to mean "strongest possible presumption against, without absolutely ruling out" is utterly unsound, of course, but it does have a certain entertainment value.