Proof? Or just what is convenient for you to believe?
If anything, quite the opposite. Think about this logically - why the need for expensive surveillance if your chief goal was to annihilate a population?
What is your source for this new evidence? There is overwhelming evidence that is quite the contrary to what you are saying at the time it happened (which is why they dropped the bomb) and even now in retrospect.
By most approximations, there were about 200,000 causalities from the bombs and their aftermath.
That said, had the bombs not been dropped, estimates ran into the millions for Allied casualties and tens of millions for Japanese (civilian + soldiers) casualties.
Ultimately it boils down to an issue of numbers (achieved by expediency).