The war itself,the massive fire bombings of Japan, the Germans bombing London, the Allies bombing of Germany, the attack at Pearl Harbor, and many more like that were just as bad. Japan didn't have to attack Pearl Harbor. We could have won without fire bombing. The Germans actually lost themselves the war bombing London, because they were just about to obliterate the RAF's bases and radar stations. Bombing London was like saying "Oh, heck, let's not bother killing all the terrorists, let's kill their families by nuking Bahgdad". Etcetera.
So it wasn't that bad.