Terrific Article on Conspiracy Theories in General and 9-11 Theories in Particular
I didn't see this one over the weekend, but it's well worth perusing:
In response to this testimony, many conspiracy theorists reply that scientists who offer evidence disputing the conspiracy theory are part of the conspiracy itself. And the more evidence they offer in favour of the official version, the more strongly they are connected with the conspiracy. As Keeley puts it "conspiracy theories are the only theories for which evidence against them is actually construed as evidence in favour of them."