WW2: To Bomb or Not to Bomb

I think that Truman and the United States military made the right call to drop the atomic bombs on Nagasaki and Hiroshima. There were, to put it lightly, some very negative effects that came from this, but I believe it had to be done, and I have many reasons to back this up.

1. It is the duty of the U.S. military to save its own cities first, not those of other countries. It was the best choice in order for the U.S. to win the war.
2. Using two atomic bombs to end the war quickly was better for the U.S. economy than possibly drawing out the war for an unknown amount of time by using the same technology as before.
3. It ended the war quickly, which possibly saved lives of many more thousands of soldiers, both American and Japanese. It definitely saved the lives of U.S. soldiers, but no one knows how much longer the war would have continued for.
4. It was the most effective way to beat the Japanese. They were adamant about not surrendering, so the U.S. needed to prove how badly they could crush them.
5. Other countries had similar atomic technology, the U.S. just built it better, first. Had the Japanese had the bombs instead, the U.S. may have gotten bombed instead, possibly more than twice.
6. The U.S. gave Japan warnings ahead of time and opportunities to surrender before the bombs were deployed. The U.S. received no such warning or opportunity for surrender before Pearl Harbor.
7. Hiroshima and Nagasaki were not regular civilian cities, they were industrialized military cities. Although civilians were there, so were soldiers and military equipment.
8. It helped stop the spread of Communism because Stalin, at this time, was beginning to get interested in the Pacific area.
9. Many more died at the Battle of Stalingrad, or even in the bombing of Tokyo than at either Hiroshima or Nagasaki.
10. It showed every country on Earth what the U.S.could do. The U.S. obviously haven't had to use it again.
11. It got revenge for Pearl Harbor.
12. It did not completely decimate the cities. About 1/4 of Hiroshima's population was killed in the blast, not everyone died.
13. Japan has since grown into a major world power. The atomic bombs obviously did not hold them back for long.
14. The Japanese government had a chance to save their own people, but didn't.