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I didn't say journalists do out lying sources (although I'm sure some have) - I said that the code of journalistic ethics typically holds that sources who feed knowing lies to journalists shouldn't have their anonymity protected.
Here is one explanation of that principle - I don't have a lot of time find more, but I will later -
http://majikthise.typepad.com/majikthise_/2006/06/why_journalists.html