I don't think that they really need to rush things along A-bomb-wise. What's being dropped right now will be just as likely to make whoever survives to be hanged by the States to say that he never expected the Americans to resist as forcefully as they did. Funny thing about the IJA and the Nazis...they never understood that people wouldn't quit no matter how cruel they themselves were. The Nuremberg and Tokyo war crimes trials were all about how they never expected the level of resistance they faced.
Hitler wanted not give up, in end he belief (like his entourage claims) that [WW2] was like Seven Years' War and that Third Reich would be save by miracle just like Prussia.
eider by miracle weapon aka the V series or that one of Allies drop out race like Russia in end of Seven Years' War...
this bullheadedness of Hitler, combine with blind obedience (almost religiously) belief in Hitler of his subordinate and people, Germany was still ready to ran with Hilter into Hell...
(thanks to the Propaganda Machine of Joseph Goebbels)
Japan Empire had cultural/social Problem of obedience and follow order into certain death, without question them.
There allot of bizarre cases in WW2, like Japanese Soldiers who following there last order and were still in war in pacific until 1980s.
or this notorious case were a entire Japanese bomber fleet got wipe out by USNavy Hellcats, because the Japanese's Fleet commander refuse to take countermeasures and his subordinate obeyes him loyal into death...