9-11 was a result of profound and perhaps even willful negligence on the part of the Cheney-Bush junta. The simple facts were staring everyone in the face and the Truthers should have been hammering those, not chasing and churning pseudo-scientific bullshit. Every caps-locked post and garish wake-up-sheeple web page was used to discredit critics of the Great War on Terror.
This is the paradox of such paranoia. Conspiracy enthusiasts eagerly swallow the idea that 9-11 was a complex and flawlessly executed inside job, without a single leak or turncoat, yet stick at the notion that they're being played for chumps, that real conspirators are using their paranoid fantasies to misdirect public attention and discredit critics.
The Moon shot was heavily promoted by John F Kennedy, one of the archfiends of the conservative Inferno, and offered incontestable proof that tax revenues may be usefully spent on popular, successful, and ground-breaking programs. This is in direct contradiction to the conservative world view, so an alternate 'truth' had to be 'found'.
The reptilian thing strikes me as classic authoritarian paranoia. Conservatism is the desire to concentrate power in the hands of the right sort and what could be more horrific to the authoritarian mindset than the idea that HM is not even human, let alone a proper sovereign? Besides, it's all about who is breeding with what, isn't it? Such things don't concern progressives nearly so much, I find, and you and I are quite comfortable with the idea that the Windsors are monsters, albeit of the all-too-human sort. We don't need fairy tales to convince us, since the ordinary facts of our experience are more than sufficient.
There's an old yet very good and still quite timely essay on conspiracy mongering in American politics:"The Paranoid Style in American Politics"
Most insightful, especially in these latter days, when the entire Republican party exists wholly within an alternate reality created and mediated by Rupert Murdoch and Roger Ailes.