Prophecies of doom are the best sellers.
This genre of literature dates back to biblical times, and many religions are founded on it up to the latest Supreme Truth in Japan and Russia. There are also optimistic prophets but fewer of them. Technology has advanced human life, and there are plenty who say it will continue to do so. Nevertheless, technological gloom still dominates the shelves in bookstores and libraries. The best way to evaluate prophets is to wait and see if their prophecies are fulfilled.