It clearly shows that you have absolutely no clue of what you're talking about.
Being from Germany I can assure you that Nazi symbols are not banned from any history book or documentation or whatever. But presenting Nazi symbols in another context than education (or similar) is not allowed.
This ban helps keeping Nazis under control - you have a simple thing in your hands to kick their butts with this law and others. Additionally, regarding the well known history of Germany there is NO REASON to show, wear or use Nazi symbols other than for a) education (allowed) or b) propaganda for forces against the German democracy (disallowed).