Understanding the rampant fabrication of "facts" by the right wing

Here is a well-expressed comment by Robert1014 at Glenn Greenwald’s post (Unclaimed Territory) on a blatant falsehood in the right-wing blog, Instapundit. In "Fact-free Instapundit inflicts more false conventional wisdom on his readers," Greenwald notes Instapundit’s totally false claim that the Virginia primary victory of Jim Webb (the presumably centrist former Reaganite-turned-Democrat) was a defeat for the “Howard Dean-Kos fringe” of the Democratic Party – the “far left” -- despite the inconvenient fact that Kos actually endorsed Webb:

At least part of this has to do with the cognitive dissonance which extremist right-wingers experience when facts smash their cherished dogmas to powder...they cannot stand to experience this cognitive dissonance, so they latch onto--or create--any small fictions or distortions of reality than can in order to shore up their insupportable faith-based "reality." Aside from the political and rhetorical uses of such dishonesty, it serves the necessary psychological function of allowing the anguished zealots to ignore the truth and burrow ever deeper into their deeply-held delusions.This is true of zealots of all stripes, not just right-wingers, but at this moment, extremist right-wingers are the most visible and the most desperate to maintain their fantasy-world.