Horror movies where the villain is so sympathetic that you root for them.

Lilly/Mr. Wriggles* in Late Night With the Devil. You just want her/it to lay waste to all those clowns exploiting her. And you’re not disappointed. Ingrid Torelli as Lilly is utterly terrifying in that film. Best performance in a horror I’ve seen since Toni Collette in Hereditary.

*From the context clues in the film. I believe that Lilly/Mr. Wriggles is now a single entity, so there is no longer a practical difference between them.