1. One reason the political literati, excepting people like @NormOrnstein, have been slow to recognize the gathering storm? They've always assumed that right-wing propaganda outlets—from Fox to Gateway Pundit—were just for "the rubes."
2. They've assumed that GOP elites continued to operate in a normal info environment. This remains true for some, but the tide has shifted. Saclia's outburst toward the end of his career—let alone indications from federal judges on lower courts—should've been a wakeup call.
3. Now POTUS himself spends hours watching FOX, while elected officials across the country are thoroughly propagandized. Even some intelligence and ex-intelligence officials peddle right-wing conspiracy theories: proving that having access to good info doesn't make you immune.