First I would like to make it perfectly clear that I neither condone nor condemn the USA for the dropping of the Atomic bombs on these cities. I am ambivelent on the matter. I am also well aware that had the Japanese had the bomb they would not have hesitated to use it.
Given that the dropping of the bombs doubtlessly saved the lives of thousands of American service personnel which would have been lost had an invasion of the Japanese home islands taken place.
Also many Allied POWs lives were saved because the bombs were dropped
Obviously thousands of Japanese would have lost their lives as well, miltary and civilian.
As I understand it the bombs detonated at roughly 2000 feet above ground level.
Now then, if the US had detonated these bombs at a much greater altitude thereby demonstrating to the Japanese that they, the US, were now in possession of a weapon capable of mass destruction on a scale hitherto unknown, would not the Japanese have capitulated before this destruction was visited upon them?