Guillermo Del Toro said this quote

The discovery of the horror tale at an early age was fortuitous for me. This sort of tale serves, in many ways, the very same purpose as fairy tales did in our childhood. It operates as a theater of the mind in which internal conflicts are played out. In these tales we can parade the most reprehensible aspects of our being: cannibalism, incest, parricide. It allows us to discuss our anxieties and even to contemplate the experience of death in absolute safety.And again, like a fairy tale, horror can serve as a liberating or repressive social tool, and it is always an accurate reflection of the social climate of its time and the place where it gets birthed.