In the absence of evidence, invention and speculation don't really help. Moreover, the reality of conspiracies coming to light and burning the conspirators should always be considered when concocting theories.
In the same vein, until I see actual evidence (and not just "Mr. SoAndSo said so-and-so is true), I'll factor in the claims of the US government and media as just hypotheses.
I think its unfair to say that we should refrain from discussing or theorizing about topics when the truth is murky just because we can't test it. I'd test it if I could, but the reality is that we're never going to have that ability (unless we magically achieve complete governmental transparency somehow).
http://www.independent.co.uk/news/world/us-government-pentag...