Certainly with a book, people are going to be able to read it and give themselves permission to have that delicious feeling of being terrified because they're in a safe place while they're reading. That's what you can rely on as a writer, that people can let themselves be really frightened because they're really all right.
Having your book edited is like watching your cat being operated on. It's uncomfortable and someone is probably going to get hurt. Most likely the cat. But in the end, things work out for the best and your cat is better it. And then your cat gets released in hardcover, and you have to read all of his reviews.