Even if leaving the emperor in power wasn't just going to lead to a new war in the future. Japan had four conditions for surrender. 1: The imperial government

Even if leaving the emperor in power wasn't just going to lead to a new war in the future. Japan had four conditions for surrender. 1: The imperial government stays in power. 2: The imperial government handles disarmament and demobilizing the military. 3: No occupation of Japan or it's territories. 4: The imperial government handles trial and punishment of their war criminals.