There is that, but in a more general sense I think people like conspiracies because they have a deep need to believe that there is an intelligent direction to human affairs, even if it is malign, and that the world is not actually chaotic and uncontrolled at the largest scale. It stems I suppose from infancy when even while we pushed at them we needed to know the unfathomable rules our parents set came from a better understanding of things than was available to us.