FGS
What makes the liberal bias in the mainstream media so pernicious is that they deny that they're biased and insist that their twisted version of events is "reality," and anyone who disagrees with them is either mentally or morally suspect. In other words, they're fanatics. And, like all good fanatics, they're utterly convinced that they're in sole possession of virtue and truth.The "mainstream media" convey the perspective that they do because that perspective - "the sky is falling!" - attracts attention. If that perspective is untrue, there really is no need for "mainstream journalism" at all, you can just walk past the newsstand without buying the paper.And the "mainstream media" are "mainstream" because among themselves they do not compete on the basis of perspective but only in how they present the perspective that "the sky is falling." They do compete, most vigorously, with conservatives on the basis of perspective. They claim the turf of "objectivity" - more or less the same thing as wisdom - exclusively to their own cabal. A cabal which coalesced naturally around the perspective which was most profitable for journalism to project, irrespective of its relation to truth in historical context.