As to the bombs in Japan do a bit of research before you blast off! The atomic bombs killed lots of people but some of the bombing raids on Tokyo killed more! If the bombs hadn't been dropped MANY MANY MANY more civilians would have died in a 'conventional' war! Read about the fire storms as the paper houses burned generating HURRICANE force winds actually picking people up and hurling them into the flames as they tried to run! Children actually pulled out of there mothers arms! Horrible horrible things so if you kill 100,000 in 'conventional war' and it's ignored you kill 100,000 in a GIGANTIC mushroom cloud to get their attention! Guess what though it almost didn't work! The japanese generals were refusing to surrender after the first atomic bomb! If you need proof of that all you have to ask is why drop a second bomb? Why didn't japan surrender immediatly? The answer is they weren't going too! They were flat not going to give up! Hell I've even read that after the second bomb many generals were refusing to surrender!
It is you who needs to do a bit of research before "blast(ing) off". This is not just my opinion, or even Eisenhower's opinion, this is fact: Japan was looking to surrender before the bombs were used. Saving face, and preserving the Emperor were of extreme (religious even) importance to the Japanese, and so they would only surrender under terms that allowed them to do so. And in fact, even after the two bombs, MacArthur made provisions to allow the Emperor to continue to act as a powerful figurehead to the Japanese state. A wise move, imo; guess how many American servicemen died at the hands of insurgents in occupied Japan after "mission accomplished"? Zero.
You are correct about the fact that the firebombings of Japanese cities killed even more civilians, more horrifically, than the bombing of Nagasaki and Hiroshima combined.