Sometimes, a person may want to read a book and not have to think deeply, just let the story take them into "another place" for a while and allow them to be entertained without requiring them to concentrate on a "message" or look for an allegory behind every bush, so to speak.
Well, I do understand such feelings. I like to enjoy what I read and to be regaled with a good tale, even amused when appropriate. However, I am a thinker. I actually find much pleasure in having to think deeply, in being challenged to find hidden meanings in things, and in discovering profound truths in what I read.