Journalism cannot be neutral toward a threat to the conditions that make it possible.

Rush Limbaugh called government, academia, science, and media the “Four Corners of Deceit.” This is not just run-of-the-mill ranting. It expresses something profound about the worldview of conservative media and its audience, something the mainstream media has ignored, denied, or waved away for many years. In Limbaugh’s view, the core institutions and norms of American democracy have been irredeemably corrupted by an alien enemy. Their claims to transpartisan authority — authority that applies equally to all political factions and parties — are fraudulent. There are no transpartisan authorities; there is only zero-sum competition between tribes, the left and right. Two universes. One obvious implication of this view is that only one’s own tribe can be trusted.

Over time, this leads to what you might call tribal epistemology: Information is evaluated based not on conformity to common standards of evidence or correspondence to a common understanding of the world, but on whether it supports the tribe’s values and goals and is vouchsafed by tribal leaders. “Good for our side” and “true” begin to blur into one. Now tribal epistemology has found its way to the White House. President Donald Trump and his team represent an assault on almost every American institution — they make no secret of their desire to “deconstruct the administrative state” — but their hostility toward the media is unique in its intensity.