Simple. The director worked with the Japanese and American governments to create a reason why the Japanese Emperor lost that didn't delegitimize the government.

Simple. The director worked with the Japanese and American governments to create a reason why the Japanese Emperor lost that didn't delegitimize the government. Who could fault a surrender after a "superweapon" was used on you?? Genius black ops on the part of the US and Japan! Then they create various movies propping up the idea. Turn Japan into America's R&D division for electronic development so we didn't have to educate Americans and could continue to dumb down the education system and keep the rowdy Americans in check until they were needed for the next war.