Oh, really? So you are denying Poland now has laws on the books that ban the Swastika and other Nazi symbols including, and this just happened recently, the Sickle and Hammer.
You forget that the symbol is banned when utilized for non historical reasons. As it is in many other European countries. History books, schoolbooks and museums still showcase those symbols. But the symbol cannot be used for clubs, restaurants or generally non educational purposes.
The usage of such symbols in film is often allowed for educational purposes, but some countries do not feel that games can fall in that same category. Those symbols are in direct connection to the regime, and European governments do not want those symbols to become a symbol you'll see on toys.
Look at the people wearing Fidel Castro t-shirts without actually knowing who he is or what he did. Europe was directly affected by the second world war because the war took place on its soil. Above all that what happened must not be forgotten over time. And for that its important out of respect of those who suffered during the war, that the symbols of a regime that caused loads of suffering won't be turned into a toy.
This is the reason as well why there are so many American SS realism units for games compared to European ones. Americans won't be happy if people would create a Klu Klux Klan for a game either, and for a lot of European people SS units feels similar but actually worse.