"There are experts on morality?"
That's my point. Bringing up that a scientist on the project left it out of a moral concern isn't making a significant point, let alone "q.e.d."
"I'm not sure you could have predicted that using the bomb would equate to saving future lives in a time period that hadn't yet manifested."
"Because if that particular motivation can be discounted, then so to can the justification."
Um... no. You're arguing from a motivation-based notion of morality. I'm arguing from a results-based one. Of course they couldn't have known at the time that this was going to save lives in the Cold War, but if the end result is that it did then you can't discount that simply because it was an unintended consequence.
"If you read the reference you will see that Rotblat outlines some of the reasons that his fellow scientists gave for persisting with the work.
He, however, actually did make a moral decision to leave the project; a decision which others have said did not occur to people at the time to make. Moreover, your view that the scientists involved had no particular moral imperative/responsibility for the consequences of their work is highly questionable. Would you be prepared to extend this to all employment/research?"
I think you're grossly misinterpreting my point. It was simply that a scientist on the project leaving over moral concerns is not expert testimony, because the scientist is not an expert on morality but on science; thus, presenting it as though it's some kind of boom-q.e.d.-end-of-story point is fallacious. It's a false appeal to expert testimony.
"You also forgot to address this remark made by the head of the Manhattan Project:
"the real purpose in making the bomb was to subdue the Soviets""
I didn't address it because I don't care what the motivation was in making the bomb. I'm only concerned with the end results of its use, which I hold to be the best means of ensuring the surrender terms the US felt was necessary with as few casualties as possible.
"I agree, and to be blunt the only explanation that springs to mind is denial that the USA could engage in such a murderous act. From someone who grow up in a London devastated in part by the missiles built by Werner von Braun who was given refuge by the American government on condition that he helped develop their rocket programme, this comes as no surprise!"
So a results-based look at morality didn't once occur? That the bottom line of saving lives is somehow not an argument, and that everyone supporting the notion of using the bomb is brainwashed into thinking that America can do no wrong?
Considering I'm sitting here supporting aforesaid notion while having explicitly gone on record earlier in this thread saying the US brought 9/11 on itself by dicking around in the Middle East for half a century, I find this statement preposterous.
"It's an argument because the two people I would trust most to give the death estimates of the war continuing, General Dwight Eisenhower and General Douglas MacArthur, said at the time that there was no need for a land invasion, the Japanese would surrender if we gave them the one concession that we ended up giving in the end. It wasn't a binary choice between bombs or land invasion, and I'd trust MacArthur's estimation of the Japanese will to fight (since he had, you know, been fighting them) over anyone's in this thread."
I feel like if US leadership as a group felt like Japan would surrender if the one concession were given that they wouldn't have dropped the bomb. It seems to me that the very authorization of using such a potent device would itself be an indicator of its necessity. Unless you want to paint the collective US leadership as a group of sadistic bastards, you would just about have to concede that they felt it was necessary. From the motivation-based moral outlook, the notion of it being absolutely necessary to ensure an end to the war and save lives should be sufficient justification, no? And from the results-based moral outlook, we don't and can never know if the Japanese would have surrendered without bombs or land invasion; thus, we have to look at the binary choice, and we see that the nukes were clearly the best life-preserving option.