"Truth decay" is the common term for this. Usually it's considered as an attack on expertise and authority, but associating a belief with a government conspirac

"Truth decay" is the common term for this. Usually it's considered as an attack on expertise and authority, but associating a belief with a government conspiracy is no different than associating it with any other conspiracy. "Rational dissidents" is not redundant. Being a dissident doesn't make someone rational, and being conventional doesn't make someone irrational. All such assumptions or insinuations are forms of truth decay.