I don’t think you should expect that the average proportion of votes should correspond to the expected number of won chunks. This is a known property of first past the post electoral systems, which mayoral elections approximate.

There’s slightly over 2000 cities and towns in Germany. If there was a party that gets 1% of the votes, you would not expect them to get 20ish mayoral seats, without further information about clustering of voters, you’d rather expect them to be somewhat homogeneous in their losses (because of the mechanisms that cause the low popularity presumably (!) applying everywhere; if the 1% of voters were all coming from the same place because it’s a hyperregional party for example, that would possibly change).

Now, sadly, there’s a bit of clustering going on and that makes fascist mayors more likely, but I guess other than that, one possible conclusion here is: Fascist voters are everywhere, so whatever mechanism is behind their etiology, it applies all over the place.

The media landscape and dominant politics feeding into what feeds fascists is a “likely” candidate here. Scare quotes because, like, cmon. :| Friede, Fritze…