There are those who believe aliens don't exist. There are those who believe aliens do exist. And then there are those who not only believe aliens exist, but spend every waking moment collecting information trying to prove it.
I've found many places over the years that claimed to reveal "the truth," and combine all the conspiracy theories into one alternate history of the world via aliens. Here's a good one called "Majestic 12 and the Secret Government." It really is amazing how people can tie a wide variety of theories, paranoid delusions, and actual facts into a coherent narrative. Might make a good movie or something.