Sorry, but I utterly disagree. Full disclosure: if not for the sudden end to the war in the Pacific, unforeseeable without the use of the atomic bomb, I probably wouldn't even be writing this. My father narrowly escaped death off Okinawa, where his lightly-armed, unarmored, and highly vulnerable merchant ship was repeatedly targeted by kamikaze attacks. When the war ended, he was scheduled to return to the Pacific, where the Japanese had five times as many kamikaze attacks readied - Allied planners estimated that 1/3 to 1/2 of the invasion force could be lost before landing.
The last straw was not Soviet attacks against the Japanese army occupying Manchuria, which was not considered a core part of the Japanese Empire. Starting in 1942, most of the Japanese army in Manchuria had been transferred to fight the US; what remained was raw recruits, understrength and poorly equipped. Indeed, in his speech announcing surrender, Emperor Hirohito referred to the atomic bombings, but not once to the Soviet attack, a view he repeated to General MacArthur in September 1945.
I am at the forefront of those calling for further sharp reductions in American (and other states') nuclear weapons. I am proud to be considered a member of the US delegation that negotiated the New START Treaty, which cut the number of deployed strategic nuclear weapons and their launchers for both the US and Russia. I am proud of the work I did to push for a treaty ending production of fissile materials for nuclear weapons (Pakistan continues to block work on such an agreement.) . I have written both of my Senators, and my Congressman, urging them to support the P5+1 Iran deal. I have made my support for that deal very public. I even question whether US interests in the Pacific and Asia were of a such a degree as to risk provoking war with Japan (my internal jury is still out on that one). But I do not let my strong, unshakeable stance against the continued construction and possession of nuclear weapons blind me to their great utility in ending the horrors that would have ensued had World War II been prosecuted after August 1945.