I do wonder why the occupation authorities did the exact opposite for Germany, emphasizing war crimes, collective guilt, etc, since (West) Germany was also a bulwark against the Soviet bloc?
It may just be that there were different people involved making different decisions.
But I suspect the reason was they viewed Naziism as a greater evil than Communism, whereas the emperor worship in Japan was seen as relatively harmless. Though they did hang a whole lot of Japanese politicians and officers.