Except it was used in war - twice - rhe first time only three weeks after it was first tested at Trinity Site, the second only three days later. I’m not complaining. Estimated US casualties if we had to assault the Japanese home islands were a minimum of 250,000 to a maximum of 4 million. That’s from a 1945 US population of only 140 million. All in all, it probably even saved Japanese lives although that was little consolation for the hundreds of thousands of Japanese that did die.