Thank you for the explanation. Unfortunately I can't reach the link. It seems the generation of the symbolism originates in the extremist groups, so I'm wrong in pointing the connection to the other side.

However, I'm still strongly against historic revisionism through whitewashing some elements and making appropriate depictions a taboo, whether in books or in cultural elements like games, video, or other things. The more we separate these things as strict black and white things, the more we are numbed to the gradual shift in the evil's direction. Making things taboo and learned underhand via shady gatherings or groups only serves them, does not help rationally put that knowledge into the right mental place.