It's its own kind of horror for these books.
I did wake up one day to the realization that I had up to this point not been willing to take the next steps and put insight into action. And when I realized that, it was like opening floodgates. I started doing the things I had learned about, and they started to change my life. But there is a pretty important and major milestone to make this transition.
I don't think it's necessary or helpful to frame this as a kind of horror. I think it's more helpful to just change how you see the act of reading books. True change still has to start from within. Books in this context are just toolboxes. Toolboxes don't build anything by themselves either.
We can be glad for GP that these days it is uncommon to encounter a book with a CD or DVD attached. I’m not sure those are safe to eat.
Which is to say, once you read (or skimmed) enough of them, it's easy to get a sixth sense of the "intelligence" and "motivation" of the writer, and the sincere ones, even if not smart, are still pretty enjoyable if taken with many salt grains, and I'm a sucker for them (again, not in terms of following exactly what they say to do, but appreciating the motivation and good-intent of the author and possibly picking up something along the way.)
They'll have names like PSYCHO-CYBERNETICS and just be like "try to be nice to people and sit down and be quite a few times a day."
A sort of perfect example would be the fictional "The You You Are" from the TV Show Severance. I hope they actually write it, I know I'd LOVE it.