The nukes used in WW2 we're pathetically small compared to the megaton power of nuke technology just a few decades later. Do you think we would have had cold war if there was not a real historic example of the destructive power of nukes? I guarantee that the destruction unleashed by a launch in the 80's would have been far, far more destructive. The only thing that kept the nukes at bay was the assured mutual destruction.

The Soviet Union and America were kept at bay by the lesson learned in Japan. It was a lesson the world had to learn sometime. I'm just glad it was learned in the technology's infancy with a puny nuke, and not with todays modern mega-nukes.