Thats because the Allies are quite literally responsible for the greatest destruction of written information in human history, with almost all Nazi literature being pulped after the war and only a few copies being saved for documentation purposes (though I wouldnt put it past (((them))) to heavily edit those in order to favor their narratives). I find it surprising that Wikipedia of all places acknowledges this, but I certainly never remember learning about it in "history" class (of course they never taught us about Weimar either, so its not surprising that was omitted as well)