Some debates and some representation does not constitute "democratic tradition".
And I am really curious what would constitute a "democratic tradition" in your opinion. By 1945 the German people had been organizing themselves for around a hundred years in different parties, unions, parliaments. They had newspapers discussing everything from politics, culture, society and democracy. They had organized countless nationwide strikes and participated in two revolutions. The first chancelor of Germany after 1945 had been a democratically elected mayor of Cologne for around 15 years. Was part of a political party since 1907.
Maybe look at the Kapp Putsch. Right wing politicians and militias occupied Berlin in 1920. The democratically elected government called for a general strike and for the next couple of days the whole country stood still. No trains. No work in any factory. No news paper. No telephone. In Berlin there was no water. No electricity. Absolutely nothing. This doesn't happen in a nation with an apathetic populace which has no democratic tradition and just wants it's Kaiser back.
Democratic tradition doesn't just consist of having a parliament as the highest authority in your country if you ask me.
Those things are the foundation for what becomes democracy. To use England as the clearest example, Democracy there evolved with feudal aristocrats creating a parliament to have input to the king’s decision making, and from there parliament taking on more and more power and eventually being turned over to popular control through elections.
The Kaiserreich had a parliament. Weimar failed in the end and had plenty of problems but still it was a democratic government and that despite major challenges (Civil War, lost World War, bad economy).
And if you are willing to look into the many states and small countries that made up Germany before its unification you have 'democratic' city-states going back to the middle ages. Don't forget that Germany was and is deeply federal (Its official name is 'Federal Republic of Germany' after all).
Even right before the democracy was abolished by the Nazis the largest federal state was governed by the Social Democrats (Prussia).
Hell, our social democrats keep telling everybody that their party was founded on 23 May 1863 even if nobody cares.