World War II was the Greatest Moral Failure in Western History

The more I put aside the propaganda and look at World War II for what it really was, the more I am amazed. We endlessly blame the Soviet Union for everything that went wrong, but we give the Western allies a pass for basically handing Hitler all of Europe with almost no fight. The war would have gone very differently if the Germans had to conquer the West one house at a time in a grinding war of attrition, rather than marching triumphantly into undefended cities.