If anything they deserved a 3rd one right on tue Emperors Palace. Japan started this fight by attacking Pearl Harbor and promised us total war, a fight to the last man. They were responsible for war crimes like Rape of Nanking, Bataan Death March, Unit 731 experiments, Chinese and Korean sex slaves aka comfort women, Murdering and eating alive Australian POWs, atrocities against American soldiers and Marines, over 100,000 American civilians killed in the Pacific. Not to mention had those bombs not been dropped we would have got Zero common wealth support for Operation Downfall.
Lesson Learned Don't start something you can't finish. The Japanese government was entirely to blame for what happened.