I would definitely mention proportional representation but it cant really stand alone.
Another semi-myth is the whole 'Germans hated democracy,' trope. The Reichstag existed before WWI and has links all the way back to the Frankfurt parliament of 1848. The fact of the matter is that Germans (at least German men) were used to, if not democracy, regular elections and voting. It in no sense took Germans off guard and there isn't much reason to suspect they instinctively recoiled after its expansion following Versailles. It is true that at some points the public became disillusioned with the system and longed for a 'Kaiser-esque' figure.
But perspectives that conclude that Germany wasn't used to democracy and instinctively distrusted and disliked it aren't based in the facts.
I'm actually quite interested in what you're saying, and I do to an extent believe what your saying after thinking about it. I think it was more the transition that democracy ushered in, rather than the democratic elements itself. Democracy eroded at the traditional values of Germany in the post war period as there was no longer a judicial consequence for acting in a contrary way.
For example, in pre-WWI Germany, acts of expressionism (particularly the obscene sexuality) would have been punishable by death. In post-war Germany though, the constitutional freedoms allowed a deviation from traditional values and morals.
Even more, considering that the conservative right seized the majority of the governmental-functional bodies after the Sparticist uprising suggests that 'they' may have been able to feed lies of this erosion and amplify it in a negative connotation.