All kidding aside: almost all conspiracy theories are bunk.
It's not that conspiracies don't happen, it's that they can't be kept secret for the same reason most other crimes don't remain secret: people love to talk talk talk. Sure, you might have one loyal G. Gordon Liddy type henchman who can keep his mouth shut. But most of those involved are likely to be mediocre, career-minded bureaucrats and sooner or later one of them squeals.
Real conspiracies are much more mundane than the ones in typical conspiracy theories.
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