In my own experience when NPC types have it spelled out to them like this, usually they can acknowledge that conspiracies have happened in the past but can't comprehend conspiracies happening in the present, they act like "all that's left" is stuff like reptilians or flat earth, mundane conspiracy theories that just involve regular humans being awful only register with them once it's classified as "history" rather than modern times. It's some sort of psychological issue that probably served a survival purpose in ancient times but is just detrimental now.