That's easy enough to say from hindsight. But it was not so clear to people back in 1945.
It was reasonable for us to not want that, but this desire really wasn't much of a factor in anything.
The A-bombs were dropped with the goal of forcing Japan to surrender.
No one knew what it would take to make Japan surrender, and everyone was readying for the invasion.
Had Japan continued to refuse to surrender, we were going to invade.
Hiroshima held tens of thousands of Japanese soldiers awaiting deployment to resist our invasion of Kyushu.
Hiroshima also held the military headquarters in charge of repelling our invasion of Kyushu.
Kokura Arsenal (the intended target of the second A-bomb) was a massive (4100 feet by 2000 feet) machine gun factory. It was one of Japan's main sources of light machine guns, heavy machine guns, and 20mm anti-aircraft machine guns, as well as ammo for all of those machine guns.
The Mitsubishi Steel and Arms Works (destroyed by the second A-bomb) produced steel for Japan's war industry and used some of that steel to produce 100 naval torpedoes a month.
The Mitsubishi-Urakami Ordnance Plant (destroyed by the second A-bomb) produced 400 aerial torpedoes a month.
Pearl Harbor had been thought immune to air-dropped torpedoes because the harbor was so shallow that an air-dropped torpedo would hit bottom and embed in the mud. Aside from Tokyo Bay, Pearl Harbor was the only place in the world with such natural defenses against air-dropped torpedoes. Japan had to develop special torpedo technology designed just for Pearl Harbor in order to attack us. The Mitsubishi-Urakami Ordnance Plant was the place that designed and built those torpedoes.
Here's a picture of the Mitsubishi Urakami Ordnance Plant after the A-bomb:
https://www.osti.gov/opennet/manhattan-project-history/images/mitsubishi_image.htm
I am quite well informed. You are just wrong.
The only goal of dropping the atomic bombs was to force Japan to surrender.