Paul Marsh
NeitherWashingtonNorMecca
Bolded bit : or, if their claims are wilder, only the burden of raising doubt -- of any kind.
Spot on to both posts, anyway.
A further tactic is not to make specific claims themselves (that way they would be shot down) but instead to state "critics of the 9/11 Commission state....." or "sceptics comment that........"
This creates the image of an emerging movement or gathering storm, often out of very little.
The Reinvestigate 9/11 advert in the Independent is a classic of its type for this:
http://www.reinvestigate911.org/pages/advertisementfinal.pdf
Note for example the line:
"Speculation is now rife, not least in Pakistan and Afghanistan, that 9/11 was
not just the result of gross incompetence but some sort of an inside job."
No names, no quotes, no organisations or publications cited.
If a student submitted that in an essay, they would be lucky to get a third, yet this is the approach taken by people who expect MPs and cabinet ministers to listen to them.