Just because we crushed Germany in the World Wars does not mean that the German people cannot have some national pride. After all, their armies were the finest in the world, their empire was larger than that of Rome! Yes, they had a terrible leader, but take Hitler out of it and you have a nation that was wronged by the rest of the world and wanted to reclaim what had been theirs.
Remember, the Confederacy was also crushed by the Federals, but does that keep us from singing "Dixie" or "Bonnie Blue Flag"?