And that requirement is getting more and more enforced by more and more groups as the old social contracts are collapsing as a consequence of global changes nobody feels in control of and a lot of people aren't ready to deal with.
And as blind group loyalty is fundamentally irrational it's no longer necessary or even desirable for the accepted narrative to conform to any kind of standard for logical coherence and accordance with the observed reality, as accepting it more about showing your commitment to the group/nation/party/movement then it is about it being true, or useful for guiding behavior and decisions.
This is where we get today's problem there simply is no tolerance for any grayzones where we dont know what is right and true where big interest are at play so we cannot really have a rational open search for the truth in those area. And once you accept this for the big ticket items it's hard to then require rationality in the areas where it might still be allowed societal pressures.