It used to be axiomatic in the West post-WW II that the Nazi swastika would for evermore remain a symbol of pristine barbarism and evil, and that wherever and whenever it showed or appeared it would become the solemn duty of all people to take a stand against it. This, so the thinking went, was something we were bound to do both out of respect for the 30 million Russians, Gypsies and Jews slaughtered in the name of this execrable symbol in the past. This to ensure that nothing like the slaughter, including the Holocaust unleashed in Europe in the...