Banning things doesn't keep them from returning. It only makes them more attractive to those who are interested in being rebellious. Censoring Hitler's face and the swastika has not, does not, and will not prevent more Nazi's from existing, it only gives them a mysteriousness and sense of taboo that make them more attractive. Only by shining the light on Hitler, his ideas, and the symbols of his regime will they ever lose their power to inspire others like him. Recently, Mein Kampf was put up for sale in Germany, and sold out quite quickly. Many were worried this would mean a resurgence in Nazism, but the opposite is true. When people can critically examine the ideas found inside the book and discuss them openly, their idiocy quickly becomes apparent. The mystery fades.
Hitler WAS the leader of Nazi Germany, and the Swastika WAS on their flag. Censoring either only continues to give them both a power that they no longer deserve.
That said, Paradox needs to make money, and so as long as Germany maintains their censorship laws, then Paradox will need to comply with them if they want to sell in Germany. Paradox wants to make games, not political statements, and that is fine with me. But don't suggest that these laws do any actual good in preventing a resurgence of Nazism. Censorship is anathema to a free society.