Horse Shit!
there was a 4 year period, 45-49, when the USA was the ONLY nuclear Nation. Imagine if it was reversed and it was the Soviets that had the bomb. They would have rampaged all thru World. Should thank their lucky stars things turned out the way they did....besides..this was total war. Civilians were legit targets. More died at Dresden etc...the World was numb to mass death by this time.