This is what "conspiracy theory" ability is all about.

Some people have an aptitude for drawing abstract ideas from limited -- and incomplete -- concrete facts.

This ability allows one to understand that a narrative being promoted by mainstream propaganda is probably not true, and something else must be the real explanation.

Most people do not have this ability. Therefore, since they cannot see it, they assume that others who claim to see it must be either stupid or crazy.

In fact, they are the ones who are stupid.

Dunning-Kruger Effect: People of lesser intelligence assume that everyone else is roughly similar to themselves, and cannot comprehend how others might be significantly smarter, at least in some aspects of life.

It is not necessarily about overall intelligence, but a specific sub-set of intelligence related to abstract thinking -- which includes "connecting dots" to realize that mainstream narratives are often proven false, which means that one should discount such narratives from the beginning (others never seem to make this connection).