Is love the key ingredient of horror?

Stephen King once discussed his growth as a writer of suspense, commenting that love creates horror. This sounds very logical and makes a lot of sense. If you learn to love someone, you will become very afraid for their lives when they are in danger. When you love Sally, and Sally is being hunted by a shadow, you're afraid with her and for her. Filmmakers and authors always desire to shake their audience, and create an emotion. This love does the trick. King's point is completely valid and solid.