An interesting study has been released by Fairleigh Dickinson University on the subject of conspiracy theories. In short, conspiracy theories appeal to some people more than they appeal to others. Generally speaking, if you tend to believe in things like conspiracies you tend to keep on believing in other things like tbat being possible. On the other hand, if you don't believe generally in conspiracy theories, you tend not to believe the new conspiracy theories that come across your path.
There's a lot of interesting findings in the report which you can read in full by clicking on the link below: