I think perfection is ugly.
Once you realize that The Exorcist is, essentially, the story of a 12-year-old who starts cussing, masturbating, and disobeying her mother—in other words, going through puberty—it becomes apparent to the feminist-minded viewer why two adult men are called in to slap her around for much of the third act. People are convinced that something spooky is going on with girls; that, once they reach a certain age, they lose their adorable innocence and start tapping into something powerful and forbidden. Little girls are sugar and spice, but women are just plain scary. And the moment a girl becomes a woman is the moment you fear her most.