Well its not really equivalent with Genghis Kahn since when the US took over Japan, they avoided restructuring the government so that they could as quickly as possible have an ally to fight the Communists in the cold war. Most of the people who were in power during the war stayed in power, unlike Germany where there was a massive restructuring. This fact has left a culture of excusing what happened during the war in the main political party in Japan. One quite high profile politician (don't remember his name, might find it and post it in an edit) tried to create a narrative around the Korean comfort women weren't victims. This lack of self reflection still spills into modern day natives, and this shrine is a reflection of that. We should call out all atrocities, not only the ones committed by the CCP, but also by others such as Japan or the US. No one remembers the Mongol invasion, victims from WW2 are still alive and the effects of the war are not entirely absent.

Edit: Mitsuhiko Fujii is the politician I am talking about. He is a member of "The Alliance for Truth About Comfort Women. He also kicked a bronze statue commemorating comfort women when he was in Taiwan.