It was pretty simple: you said "they’re our people and their lives matter more" and I explained that they are not "our" people because you're not talking to an US American: you're talking to a South American. They are not "my" people.
I also claimed that, in any case, arguments out of "our" vs "their" people are fundamentally not about being civilized (which was the root of the argument, let me quote it for context: "dropping nukes was both barbaric and the more civilized option. Oppenheimer et al. deserve their acclaim.").
You can make "us vs them" arguments, but it has nothing to do with being civilized, and it doesn't save anyone from accusations of barbarism. I mean, Hitler also thought in terms of "us vs them", and look how he is regarded today.
> The person I responded to was trying to suggest the number of American lives saved was a lot fewer than estimates. Instead of saving 1,000,000 Americans it "only" saved 50,000 or something and because of that, the calculus to use the bomb wasn't as "good" as it otherwise would be if it had saved more lives.
The person you responded to was me. Your understanding of my argument is incorrect. I argued that the number mattered because the actual number is used to say "the invasion [Operation Downfall] would have caused more casualties than dropping the bomb, therefore the bomb 'saved' Japanese lives too". Please don't tell me you haven't heard this argument, which is very well known and in fact was mentioned by the original commenter I was responding to. This moral calculus has been quoted thousands of times; I'm pointing out it's misleading and dishonest.
You simply can't have your cake and eat it too. Either the numbers matter or they don't; and if they do matter, it matters that they are well justified and accurate. And it matters whether they were really thinking of these numbers when they decided to use the Bomb(s), or whether they are an a posteriori justification!
(Besides, as a sibling commenter argued, more aptly than I did: US planners wanted to use the Bomb because they had it and had spent a lot of effort developing it. They were primed to use it. They wanted to test it on a real city, with real humans, and they wanted to send a message to the Soviets, too. All excuses -- Operation Downfall, American vs Japanese lives, etc -- were a posteriori, retroactively deployed to not be portrayed as cold hearted).
> I say if it saved a single American life it was worth it, and was righteous, thus the shifting around of how many American lives saved is pointless because we know the lower bound is 1, and 1 was all you needed.
This is fundamentally wrong and doesn't support the argument from "civilization" which, again, was the argument I was responding to.
If you are going to argue American lives are worth preserving more than lives from other countries, not only do I disagree (how would you feel if I told you they are less worth preserving?), but it's also not about being civilized. So we can abandon that pretense!
