Such distinctions continue to hold a place in American foreign policy. While there is still an artificial genetic differentiation, religious bigotry is again in play ('Christian' v. 'Muslim') as it was in 1942-45 ('Christian' v. 'Shinto' / 'Buddhist' / others ...) as a foil to block the economic justification for taking from those who 'aren't like US!' A couple of WWII veterans of the Pacific War who would have been personally affected by Operation Downfall — the invasion of the Japanese homelands — still felt it necessary to make amends for the atomic bombings which happened instead of the traditional massive invasion, thus saving their lives to be able to make apologies.
It wasn't just Japanese who suffered from the Bomb - among the Nagasaki dead were American POWs.
Some believe to this day that without these bombs, Japan wouldn't have surrendered, and would have fought to the last person when invaded. I wasn't there, so I can't say who was right. But I can defer to some who were there to tell their story — an Army Air Force chaplain and a US Marine (slated to participate in the invasion of the Japanese homeland).
In Nijyuu Hibaku (Twice Bombed, Twice Survived: The Double Atomic Bomb Victims of Hiroshima and Nagasaki), by director Hidetaka Inazuka, seven survivors who lived through both atomic bombs recount their experiences. These people suffered the terror of an atomic blast, not once, but twice. For a long time, no one noticed that such double-bombing victims existed. There is no good excuse for this oversight, as Robert Trumbull wrote Nine Who Survived Hiroshima and Nagasaki, published in 1957 by Charles E. Tuttle Company of Tokyo, Japan, from data gathered during the 1950 census conducted by the Atomic Bomb Commission. The only logical explanation for this 'ignorance' is that the Japanese government didn't want to acknowledge that some of its wartime citizens got to experience Hell twice.
Was there another option? Was there another reason? According to this article, the answer to both questions is: YES. So why was the Bomb dropped on Hiroshima?
British scientist P.M.S. Blackett suggested (Fear, War, and the Bomb), that the United States was anxious to drop the bomb before the Russians entered the war against Japan; the Japanese would surrender to the United States, not the Russians, and the United States would be the occupier of postwar Japan. In other words, Blackett says, the dropping of the bomb was "the first major operation of the cold diplomatic war with Russia."