Though with full 20/20 hindsight, we can dig up historical facts and adjust our historical conclusions, Allied forces were obviously not privy to the immediate situation with respect to Soviet forces.

Moreover, to suggest that the instantaneous destruction of major bases and cities the likes of which history has never seen shouldn't bee seen as a primary impetus in Japanese decision making is irrational.

Japanese Imperialism was effectively a mass murdering machine let loose on the entirety of E/SE Asia and America, and the Americans did the necessary fighting leading to the weakening of the Japanese regime which put them in a state where the threat of some Soviet antagonism would even be a real problem.

If the US had not entered the war against Japan, the Soviets wouldn't be much of a real threat.

The dropping of the bombs was easily justified, and thankfully, since that moment, there have been fewer and fewer major wars.

The odd logic trying to paint the US as somehow antagonists in that situation is anti rational on it's face, it's just petty.

"Truman stated that his decision to drop the bomb was purely military. A Normandy-type amphibious landing would have cost an estimated million casualties. Truman believed that the bombs saved Japanese lives as well. Prolonging the war was not an option for the President. Over 3,500 Japanese kamikaze raids had already wrought great destruction and loss of American lives."

Here is one source which details some of the questions being raised https://nationalpost.com/news/did-the-atomic-bombings-of-hir...

However I was probably wrong in saying most historians disagree, it seems there is still significant debate https://www.historyextra.com/period/second-world-war/atomic-...

The manhattan project involved The US, Canada, The UK and it was headed by a captured German scientist. When the project started the goal was to try to beat Hilter. Near the end of the war the US tanks never went into Berlin. The peace deal signed after the war gave up too much and the Russians never lived up to it creating the conditions for the cold war. The US was hopeful at the time.

An extended war with Japan would cost millions of lives. Japan was never going to give up as they were run by a crazy group at the time. Remember after they dropped the first bomb they refused to quit. The H-Bomb was the only thing that forced them to give up.