Hmmm. Call it rationalization, but I think that the bombings were better than the alternative. I read somewhere that the projected death toll for an invasion of Japan was in the millions, and what happened at Iwo Jima leads me to believe that this is the truth. Could there have been a better course of action? Maybe, but if there was, we didn't know of it. Plus, I do think that on some level it was a good thing that we used nuclear weapons for the first time when they were still relatively weak. Can you imagine if the first nuclear weapon ever deployed in combat was something like the AN602 or some kind of MIRV based weapon?
But Fluffywolf kind of summed it up here.