Extreme wealth and power has caused some self-appointed Deciders of Truth to band together and decide that anyone who does not pledge allegiance to anything they decide is true will be cast out of society as much as practically possible.
I remember reading Plato’s The Republic when I was young and coming away with the impression that arriving at the nature of truth was very complicated and nuanced. Apparently these tech CEOs and their buddies in government have decided to simplify everything for us proles.