My Grandfather was in the Air Corps flying into Germany in bombers in the daylight.
He said the only time he cried lwas when, after landing in the states they were put on trains for the west coast. As they approached California word had of the Atomic strikes.
They were briefed to expect 1,000,000 US casualties (more than the total in the first wave. They were told that they would, after facing the Japanese soldiers, the would face attacks by spears and suicide vests. Then were then told to kill everyone that was not already subjugated including women and children. All flight crews could expect summary beheading. Aircrews would be forced to guard their own bases as the personnel from army/navy too scarce.
In short they were told to fight and kill the women and children they came across until Japan surrender.
As they finally arrived <west coast name eludes moi> and instead of getting on transports they were processed out and return to the trains for home. No 80% casualties. Little occupation force (relatively).
He said he cried on the way how and never since (as of 1992) We would have had to use poison gas if it became a fight. Many many TONS of it were taken to the Japanese AO.
So many lives were saved with those two bombs that it is ineffable. “No quarter asked, none given”