What can't what? Not sure what you're asking, but I'm disappointed people are down voting me. All I'm saying is conspiracy theorists usually has doubts of an epistemic nature to the point where they sometimes only rely on their sense data and other times rely on people they trust. So when this quote goes on to talk about sensory evidence, I realized that this quote for people who doubt the integrity and refuse to rely on institutions or research, in this instance, that quote can be used against you, since it would make sense for their side too.