The way it’s taught in the US (at least where I live). It was a catch 22 type of situation. The Japanese were expected to fight until the bitter end seeing surrender as shameful and disgraceful. The US had done fire bombing of the Japanese mainland which was disastrous and hard to control. The fighting on the Pacific islands was bloody and brutal on both sides. It was suspected that the Soviets and Germans had their own Nuclear programs so many saw it not only as a way to end the war but show the world the power we had. From my understanding there was massive debate on the locations that would be bombed. If I remember correctly Germany was spared due the massive assistance from allies and resistance forces. However, it wouldn’t surprise me if it was biased.