When the Wehrmacht had belt buckles which claimed that  "Gott Mit Uns";  the Japanese had the code Bushido which authorized and encouraged the beheading of any opponent who surrendered as being a "dishonorable" person (and did so from the battle of Midway on), and committed The Rape of Nanking, the Korean "comfort women's" enslavement;  and the US and Great Britain and its allies chose to allow the continued extermination of the Jews and all those other undesirables in the Nazi death camps for strategic reasons; when Russia, once they were any ally, was encouraged by the other allies to commit their atrocities wherever they conquered, 'moral superiority' is virtually an invisible commodity by any National participant. 

The victors wrote the histories.  That is your 'moral superiority'  in World War II.