I read a book about events leading up to Pearl Harbor that had an epilogue called (IIRC) After The Bomb.
One of our diplomats was talking with his Japanese equivalent and the guy said they had to surrender for fear of more bombs. Our guy said we only had two. The Japanese said "If we had known that . . ." and let it drop, but it gives you an idea about how suicidal their leaders were.
[sidebar] I wrote this before but it seems appropriate here. Early 1950s some liberal outfit sent reporters around Asia, asking their opinion about the atomic bombing of Japan. (There was a big "Lay a Guilt Trip on America" then,)
They got some 'tsks tsks" from those who weren't involved, but they cut the trip short when they started asking those who suffered under Japanese occupation. Their reply was "Why did you drop only two?"
At this time a third atomic bomb was expected to be ready by the end of August. Eight bombs were scheduled to have been completed by November, and General George Marshall, the Chief of Staff of the United States Army, was advocating that they be reserved for use against tactical targets in support of the planned invasion rather than be dropped on cities.