BTTT
Gen. Lemay would have continued to incinerate most of Japan. Millions of Japanese, weakened by starvation from war sanctions, were dying of dysentary/cholera. Last but not least, the Russians would have occupied and partitioned the northern half of Japan.
Russian invasion would have drastically altered their future for the worse and would have likely doomed the S Koreans.
The atom bomb was a blessing for all.
If the Japs hadn't bombed us at Pearl Harbor, we wouldn't have bombed them at Hiroshima and Nagasaki. Sow the whirlwind, reap the whirlwind.
(By Japs I don't mean any aspersion on the loyal Japanese Americans who were wrongly interned, nor especially those who fought and bled for their (our) country.)