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 ...
The fact is that human nature consists of being friends with someone. There are people who are eager to come to power or do what they like. If you look at how wealthy people or very influential corporations act in life, then I think that there should not be questions about the real existence of conspiracy theory in the world.