I once thought as you on this, but then something happened....I grew up and read the other side of the story.
Japan is not innocent in this endevour. You can blame their imperial pride and liberal Monday morning quarterbacking.
It’s like if the US Army was on the boarder of Germany and the Germans said, “Okay, we’ll surrender...but we get to keep Hitler and he’s still in charge.” Ain’t gonna happen boyo.
Think about it...
So, got the guts to see this video?????
Now....that's an alternative history if I ever saw one. The German generals repeatedly tried to kill Hitler but Roosevelt, who was totally committed to the unconditional surrender theory for both Germany and Japan, refused to give them any moral support. He even joked about it when they were horribly executed! FDR held to the theory that they were aristocrats and thus were just as evil as Hitler.
By contrast, there was probably not a single Japanese general or admiral who wanted to overthrow the emperor. Despite this, FDR, Henry Wallace, and his bitter end New Dealer "reformers" applied the same theory for both the emperor and Hitler. Had he lived, FDR, in contrast to Truman, would have insisted that the emperor not only be removed but executed.