This is mass epistemic nervous breakdown. It endangers the whole world.
(Of note, there is no denying this by sneering that the source is leftist. The Manhattan Institute is a very conservative think tank.)
More than half of Republicans believe the 2020 election outcome was the result of fraud
More than 4 out of 10 believe 9/11 was an inside job
37% believe the Holocaust did not happen or was exaggerate
36% believe NASA faked the moon landing
1 in 3 believe vaccines cause autism