I haven't seen the film xero spoke of, so I know nothing about it.
However I have heard of the theory that the whole thing was a US plot of some kind, and certainly that is the current street-belief in most Arabian countries.
Personally, despite a good deal of proffered 'evidence', I would find it very hard to swallow. Not that I wouldn't put it past vested interests in the US to go in for such stuff - after all they bumped a President off without much concern.
All the same, somehow I doubt it. Now, as for 'allowing' it to happen, well that's a different matter, but even still...
[edited to add... mind you, I wouldn't be surprised to find it was an inside job... nothing would surprise me about these people who seek to mould history their way - it has been going on for a long time.]
On to the election, it has occurred to me that the Michael Palin's sister event on the republican side, may be a gift to the Democrats. Since she entered the fray on the comedian's side, I feel a lot safer for Obama living to the poll.