They weren't innocent, they were willing and eager subjects of a fascist state that had killed over 20 million Chinese, Koreans, and Filipinos amongst others, and there was never a chance of it being two state solution.
If there's a reason Truman dropped the bomb as an "anti-communist" measure it was to just to irredeemably prove we had them and it wasn't propaganda.
In the real world, however, Imperial Japan was an irrational state that was trying to force a conditional surrender in a war the leaders never thought they could win in the first place.
The USA waited three days between Hiroshima and Nagasaki for a surrender. It didn't happen. That alone proves there wasn't one coming from other circumstances.