Look at the dates: Aug. 9 was Nagasaki. It wasn't until the 15th that they surrendered. Up until then, the war councils actually thought Stalin would intervene and force a better peace than the "unconditional surrender" the Allies demanded.
I know everyone believes the A-bomb ended the war. Unfortunately even that wasn't enough. If it was, the Japanese would have surrendered on Aug. 10.
That's not to contradict CamperBob2 about the US would have done. We could only produce about one bomb per month, though, IIRC.
Tip to HN users: "This is indisputably true but I don't like it" isn't a good reason to downvote people.
1: https://socratic.org/questions/why-did-germans-forces-surren...
That's because Wehrmacht soldiers and their pals have warred on USSR, and took millions of lives and caused untold suffering there.
The Japanese, at that point, not so much.
So, angry retribution against Wehrmacht soldier scum was to be expected...
This didn't really matter for the Soviets. Though the Manchurian invasion was too rapid and short-lived to really escalate to European-level Soviet brutality, the Red Army engaged in plenty of the same random massacres, mass rapes, brutalities and mass deportations after they entered and occupied Manchuria.
Many of these soldiers had already long since been brutalized by their campaigns in eastern and central Europe (from which they had been shipped in massive trainloads shortly after VE Day) and the basic nature of the Soviet leadership hardly fostered a spirit of good military conduct to civilians at any time.
Some deeper reading about the Soviet Manchurian campaign reveals quite a few of the uglier details.
Also, none of this in the least bit excuses the grotesque behavior of the Japanese Army in the same region during its long occupation. Regardless of how the Japanese are perceived today, their army's habits during the 2nd World War were completely beyond justification in their genocidal viciousness.
And would the US be so magnanimous in victory had the toll been higher due to Axis victories on all major fronts (meaning that the human losses of the Axis were transfered to the Allies) up to the Atomic bombs use?
About 2.5 times as many people in Asia were killed by the Japanese as died in the German Holocaust. Let that sink in.
Anything the US did would have been seen as negligible in comparison.
If forced into an existential conflict by a string of Axis victories on all major fronts, we would've turned most of the planet into a smoking crater, and there would have been nothing Japan, Germany, Russia, or anyone else could have done about it.
Everything leading up to August 6 was just so much posturing.