Also the millions of soldiers and civilians that would have died in the full scale invasion of Japan had they not surrendered(due to the US's nuclear capability).
Lives ended by nuclear weapons: <200k
Lives saved by nuclear weapons: oodles and oodles
as you can see, they have saved several oodles more lives than they have ended.
Sadly, that is a common misconception taught by elementary teachers. Pretty much all doctors in history agree that the Japanese would have surrendered before either drop. The fact is the US wanted diplomatic leverage over Russia for post war talks.
Tokyo was burned to the ground from firebombs (600,000 dead) before an atomic bomb was dropped. The dropsites from the bomb were chosen because they were relatively undamaged from the war, therefore the US could test the bomb's full destruction.
Japan had offered to surrender every thing as long as the emperor remained a leader in name. We declined then bombed them twice, then accepted.
Still, as I posted earlier, MAD has so far prevented a world war III, and now all we have to worry about is terrorists stealing a bomb.