Humans tend to accept the first explanation they receive for anything (including you and me). Most of the media is thus based around getting there first, being the first story most people hear.

This is a feature of humans, we can assume in the distant past humans who were skeptical or didn't listen to their elders got eaten by sabertooths or left the gates unlocked were killed by barbarians.

Unfortunately even in dissident circles once you jump the first hurdle of getting people to realize the mainstream story is false you are immediately bombarded with "alternative" theories which are often ALSO extreme bullshit. And it never ends.

Sorting people into critical/non-critical thinkers is waste of time. Concentrate on winning and the masses will accept your truth. This is the reality the left knows and the right refuses to learn.