Look at it this way. If Rush Limbaugh said "the sky is blue" there are about 20 million morons in this country that would cease to believe that the sky is blue for the rest of their lives and they would gouge their eyes out for agreeing with Rush Limbaugh. Rush knows this and on certain subjects he subtly directs people to other sources that won't be rejected out of hand.
To a lesser extent the same phenomena is true for all right-wing pundits and authors. The mere fact that they say something is the proof that it's wrong and shuts the doors in those tiny minds out there to any other explanation. Forever.
All of your points are well said. Ironically, Rush just today explained that the sky is, in fact, blue.