@enigmatico The very short answer is: its very complicated to get rid of a party (for good reason) and conservatives cock-blocking every attempt at atleast trying to get the courts to check them closely.
Also saying there is no mobilization against these Nazis is a disservice to every organazation fighting their ass off to keep nazis off. Its just a very hard fight especially on social media
Something like the PRÜF-demonstrations, the Petition that is with Bundesrat, the Mass-Demos against AfD (and Friedrich Merz) last year.