When humans are left in the dark about the who, how, and why they are cognitively biased towards the most exotic theories, especially if the theories center on entities or individuals who seem to wield god-like power and either nefarious or ambiguous motives. It's a self fulfilling falatistic explanation for what seems unfixabley wrong in reality.

The "insiders" and "whistleblowers" and "retired experts" in the communities that surround these theories understand this psychological aspect and leverage it accordingly.