VIDEO : What Makes 'Hereditary' So Scary

"Hereditary" is being hailed as one of the scariest movies of the year.
What makes the movie so terrifying?
According to Thomas Page of CNN, the movie is scary because the horror happens at home.
Page argues that "Home is where the horror is."
When a horror movie takes place in a characters home there are no safe places that character can go.
---However it manifests, we all fear a loss of control over our perceived safe space.---