You see, we call it Wehrhafte Demokratie. According to Wikipedia this can be translated as battlesome democracy, though I find that clunky.

The entire idea of our constitution is to keep a democracy, we even have a constitutional right to disobedience, if democracy is threatened.

The constitution is deliberately very open, but there's one thing that's non-negotiable: FDGO, liberal-democratic basic order. If you're operating outside of that, you're not supposed to be part of the political landscape.