http://morallowground.com/2011/08/06/the-truth-about-hiroshima/
Ralph Bard, Undersecretary of the Navy:
“The Japanese were ready for peace and they had already approached the Russians and, I think, the Swiss. The Japanese war was really won before we ever used the atomic bomb.
It wouldn’t have been necessary for us to disclose our nuclear position and stimulate the Russians to develop the same thing.” (US News & World Report, August 15, 1960)
Thanks to the efforts of a number of Soviet sympathizers in the Manhattan project, most notably Klaus Fuchs, The US nuclear position was known to the Russians prior to the Trinity test, and the Russians would have developed nuclear weapons whether the bomb was used or not, so this argument is vacuous.
Security by obscurity simply doesn't work; Even if the Manhattan project had been watertight from a security perspective; and even if no bombs were exploded outside the Alamogordo Bombing range, and nobody in the US, Canadian or British program had passed any secrets at all to the Soviet Union, it would have been the height of irresponsibility for the US and her allies to simply assume that the Russians had not and/or could not duplicate their research, and build a bomb of their own from first principles - after all, the Americans did it, so why not the Russians?
Bombing Japan may have been valuable as a demonstration that the US definitely had the bomb, and a means to deliver it to a distant target; But NOT bombing japan would have been completely valueless as a safeguard against other nations developing nuclear weapons.
This is perhaps the least compelling argument I have ever heard; It's the sort of truly dumb thing only a politician could utter. There were no downsides for the US in disclosing her nuclear position; because there was no reason to expect that the rest of the world were incapable of duplicating their work, with or without the knowledge of how far the US had progressed with it. Only a moron who believed that Americans were somehow special superhuman beings, upon whose miraculous discoveries the world must always wait in awe, would make such a stupid statement. A number of US politicians from the 1950s or 60s would, perhaps fit that description very well - so it is no surprise that Bard might say such a thing in 1960; But it does surprise me that anyone in 2016 (or indeed 2011, when that article was published) would consider his idiotic words worthy of repeating.
That article is a fine example of the adage that one should always be HIGHLY suspicious of anyone who makes an explicit claim to be telling "The Truth". People who are actually telling you things that are true, generally don't feel the need to make such a claim. Articles entitled "The Truth about X" are almost invariably woefully misleading sources of information about X.
BTW, I fixed your 'link'; merely colouring text in blue doesn't make it a hyperlink.