First of all, I believe you're still missing my point, so maybe I need to be more clear. I'm fine with a simple "we didn't know better" since that's apologetic. That's not a falsehood even if it weren't possible for the Americans to know better; I'm willing to believe they acted in good faith on the best information they had. That's not even a falsehood even if there truly weren't any better options, which is of course impossible to know.

Instead you get "we did what we had to", which is unapologetic, and doesn't allow the possibility of there being better options. It basically comes down to admitting doubt vs. reinforcing belief (since asserting an unfalsifiable claim is a belief).

Nevertheless, I'm not convinced that invading Japan was the only alternative. I mentioned somewhere, perhaps not in reply to you, that dropping atomic bombs on remote regions of Japan would have demonstrated military superiority with far less casualties.

And another post in this thread linked to this article:

http://www.foreignpolicy.com/articles/2013/05/29/the_bomb_di...

If you're actually really interested in this, and maybe you are since you're obviously interested in military stuff, I'm pretty sure there are entire bookcases filled with books and journal articles weighing the pros and cons of the decision to drop the bomb.