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I noticed exactly the same thing that Glenn is talking about (in his Update Two) and I left a note at Abu Muqawama saying:
"I find your rhetorical method so peculiar here that, unless it is subject to instant bloggy-right, I think I shall paste it over to my place. What you do is, first, create a spurious air of scepticism, with the long paragraph about echo chambers, then blithely discount your own scepticism and say you think it’s probably pretty much true regardless. The elegance of this swerve is presumably supposed to dispense you from any responsibility for due diligence regarding the claim. There’s a formula here — I’ve seen this done before."
"Dr. iRack" came over and let off a smoke bomb or two, natch.