And yet in Japan.....it wasn't. We let them keep the Emperor, and made things a lot easier for the occupation.
What was that about policy not winning out again?
Negative: you are mistaken in your understanding of what transpired -- we did this to the J's -- twice -- 'cause they wouldn't surrender unconditionally.

Had they not surrendered unconditionally, it would have continued as materials permitted ... it was the correct answer to preventing untold casualties on both sides in the event of an invasion of the home islands. In the meantime, while waiting for more "nukes" ... 100's of thousands of more J's would have been killed from conventional bombing or starvation w/ a blockade.
We LET them keep the Emperor -- 'cause at the end of the day, he went along w/ us -- and 'cause it suited OUR purposes and made it easier on the Occupation.