There is a compliment people pay certain horror movies that amounts to an insult to most others. They call them “elevated.” The word suggests that a filmmaker has taken some degraded, pulpy material, something involving a witch or a troubled child or an unfortunate basement, and improved it by introducing a subject. Grief, perhaps. Or racism. The movie is scary, we are assured, but it is also about something, which apparently distinguishes it from all those earlier pictures in which people were frightened for no reason.