It's a strange political world we live in now. Back in 2010, there was a raging controversy controversy around "epistemic closure" on the right, where many on the left and some dissenting conservatives characterized fierce advocacy in GOP ranks for even the most dubious right-wing takes on the perfidy of the Obama administration as the product of an intellectual ecosystem that was sealed off from the real world-existing in a bubble through which reasonable criticisms could not penetrate. Indeed, such criticisms were summarily dismissed by the faithful as left-wing disinformation and...