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After I wrote that, I went back and read the first paragraph of Glenn's article and like in the first sentence he mentioned "trustworthy source". I wanted to clarify the difference of the word as used by Glenn. Obviously, if a source of information, especially documents, has been historically accurate, works in a certain position or agency, and discloses their conflicts and motives--and if when examined the documents survive scrutiny--then the source of the information can be said to be trustworthy.
But one can never implicitly trust a source based on their own characterization of themselves, as NBC seems to claim they are required to do as a basic tenet of journalism. That's just the most asinine thing that I've ever heard. You wouldn't even use that kind of logic to buy a used car.