I think that the professions that most believe in a prophet of doom are fortune tellers and psychics. This is due the fact that both fortune tellers and psychics depend on predicting that a prophet of doom is coming to destroy society and the world as we know it in order to make money to live on. In other words, both fortune tellers and psychics seem to be prying on the fears and concerns of some people who are firm believes in eternal doom and gloom. People who believe in the eternal doom and gloom of the society in which they live absolutely believe that the glass is half empty. I also believe that both the "occupations'' of fortune teller and psychic are fake professions and that both of those so-called professionals are just as much of a fantasy as any prophet of doom even the prophet of doom. I have only viewed fortune tellers, psychics and prophets of doom on television plays and on the big screen when I have gone to the movies. Therefore, I think that it is fairly safe to assume that in my opinion the above three entities only exist in the very creative minds of playwrights, screen writers, script writers, and authors. In fact many science fiction and horror writes such as Ray Bradbury and Stephen King write about some kind of a prophet of doom in their books. If you wish to read a book that touches on the subject of a prophet of doom who is suppose to overtake a weird carnival please read Ray Bradbury novel called Something Wicked this way Comes. In other words, a prophet of doom is a pure fantasy of a very creative imagination.
In addition, some religions might believe in a prophet of doom. I am not certain that Christianity believes in some kind of a prophet of doom exactly. However, I have been told because I am Jewish and don't believe in Jesus Christ I will be going to hell when my life is finished on Earth. I don't believe in hell but if I did I think that hell would be the ultimate doom for people with or without a prophet of doom loving in hell. All kidding aside, I am a firm believer that if you believe that your life is doomed from the start it most likely will be and if you believe that what you do will have a positive outcome to your life it probably turn out mostly positive. This is a version of a self-fulfilling prophecy. However, if you don't believe me then, you could look for the prophet of doom at Sleeping Beauty's castle in Disneyland.