80 years ago, today, the beginning of the end of World War 2 started with the atomic bombing of Hiroshima. One would have thought that this one, single bomb, instantly destroying most of the city and killing  80,000 to 100,000 people would have convinced the Japanese government to surrender, but it didn’t, and we had to repeat the demonstration 3 days later on the alternate target city of Nagasaki. Even then, a group of Japanese Army officers attempted a coup to take over the government and continue the war.
That was just how obdurate the Japanese military and government was.