Like u alluded to, people like to at least feel in control. And in the case of astrology it manifests in being able to have a simple explanation for things.
And now that I think about it, I’m sort of puzzled y more things don’t seem to get chalked up to random chance. It’s a simple enough explanation and seems ripe for abuse but strangely doesn’t seem to be. Maybe cuz by definition, its randomness isn’t that satisfying of a conclusion for people to draw