People are all different, so the reasons for them believing in conspiracies cover a broad range of factors. In general, though, people tend to believe in conspiracies because of helplessness.I found that belief in conspiracy theories is strongly linked to insecurity about employment, alienation, lack of interpersonal trust, and minority status ...
I think the reason why people believe in conspiracy theories is that some of it are convincing enough to be true. People are always curious and they always seek to know the reason for everything and they want to know the unknown. It's fascinating to know about conspiracy theories because some of them makes sense.