The following is from The Technique of the Novel - A Handbook on the Craft of the Long Narrative, originally written in 1947:
Why aren’t novels better? It is surprising that they are not worse. Real profits are made in the publishing business by employing highly talented individuals who understand, intuitively in most cases, I believe, the dumb yearnings of dumb people and devise products to please them and keep them dumb and happy. Most books of fiction are written solely to entertain. Where one novel educates or enlarges the mental horizon of the reader, a hundred confirm his prejudices and exploit his ignorance. If novelists as a whole made even a beginning at telling what they know to be true, the book publishing business would collapse. (Thomas H. Uzzell – The Technique of the Novel - A Handbook on the Craft of the Long Narrative)
The more things change, etc., etc.