It's not harmless if people begin with "Oh yes, my astrologer said this partner would be my perfect match" and a few years later they end up with "The jews are actually lizard people that control the world economy, we must stop them."
This seems... unlikely, though. There does seem to be some "crank magnetism" effect (people who believe in one form of nonsense tend to adopt others), but it's heavily tilted towards _conspiracy-based_ nonsense. So people who sincerely believe the earth is flat and there is a grand conspiracy to conceal that are probably good fodder for qanon and the anti-semitic stuff and what have you, but it's not clear that astrology people are.
