I see some people are doing everything but addressing the point that three days was far too soon to be dropping another atomic bomb on Japan, not to mention the fact that the bomb should not have been dropped on a civilian target, a target that happened to have had the largest Christian population of any Japanese city.
We rightly said that the 9/11 attack on the Twin Towers in NYC was barbaric, but in the Pacific War we killed hundreds of thousands of civilians, mostly women and children, in our air raids on Japanese cities.
As for Japanese occupation, go read Hildi Kang's book Under the Black Umbrella: Voices from Colonial Korea, 1910–1945. Kang interviewed a large group of Koreans who lived under Japanese rule in Korea and was rather stunned to discover that most of them never experienced cruelty and that quite a few of them said they had no problems with the Japanese. Yes, there were some cases of abuse and cruelty, but these were the exception, not the rule.
Or, read General Elliott Thorpe's book East Wind, Rain. Thorpe was very critical of the Japanese, but even he was willing to admit that the Japanese treated Dutch prisoners from Java better than Sukarno's soldiers treated them.
When the Japanese took over Korea, they spent billions of dollars building schools, bridges, power grids, water works, roads, etc. Korea's economy improved tremendously under the Japanese, thanks to these investments.
Similarly, when the Japanese took over Manchuria, they invested billions in infrastructure. Under Japanese rule, Manchuria became an economic miracle and attracted workers from all over Asia because word got out that there were jobs to be had there. Before the Japanese came to Manchuria, the region had been divided into tribal areas ruled by warlords. One of the reasons the Japanese moved on Manchuria was that the Soviets were trying to bring Communism to the region. The Japanese were fiercely anti-communist and pro-private property.
Now, was Japanese rule in Korea, Manchuria, and Taiwan identical to American rule in the Philippines? No, it was not. But, it was a whole lot better than Chinese Communist rule, Nazi rule, and Soviet rule.