All my friends who served in WW2 are dead now, so I can't confirm it, but they spoke of how the war was in full swing, & looked likely to continue for a long long time even after invasion of the home island. Once both bombs were dropped, that all changed. Those bombs likely resulted in a large net saving of lives, most importantly allied lives.
Was Hiroshima Necessary?
Apart from the moral questions involved, were the atomic bombings militarily necessary? By any rational yardstick, they were not. Japan already had been defeated militarily by June 1945. Almost nothing was left of the once mighty Imperial Navy, and Japan's air force had been all but totally destroyed. Against only token opposition, American war planes ranged at will over the country, and US bombers rained down devastation on her cities, steadily reducing them to rubble.
What was left of Japan's factories and workshops struggled fitfully to turn out weapons and other goods from inadequate raw materials. (Oil supplies had not been available since April.) By July about a quarter of all the houses in Japan had been destroyed, and her transportation system was near collapse. Food had become so scarce that most Japanese were subsisting on a sub-starvation diet.
American officials, having long since broken Japan's secret codes, knew from intercepted messages that the country's leaders were seeking to end the war on terms as favorable as possible. Details of these efforts were known from decoded secret communications between the Foreign Ministry in Tokyo and Japanese diplomats abroad.
In his 1965 study,
Atomic Diplomacy: Hiroshima and Potsdam (pp. 107, 108), historian Gar Alperovitz writes:
Although Japanese peace feelers had been sent out as early as September 1944 (and [China's] Chiang Kai-shek had been approached regarding surrender possibilities in December 1944), the real effort to end the war began in the spring of 1945. This effort stressed the role of the Soviet Union ...
In mid-April [1945] the [US] Joint Intelligence Committee reported that Japanese leaders were looking for a way to modify the surrender terms to end the war. The State Department was convinced the Emperor was actively seeking a way to stop the fighting.
The Japanese were defeated, and they knew it, and the US government knew it. Yet the US government still dropped the Fat Man and Little Boy on them.