Conspiracy theorists, unlike normal people, find it easy to believe that people will expend enormous effort to create an illusion. I'd like to take this opportunity to say we told you so.
I'd argue that it's the anti-conspiracy theories, that are just as common and almost as insidious. For example, the idea that the intelligence agencies aren't aware of what their government representatives are doing in the background, and can't/don't influence it. There are literally thousands of individuals who work in the same town with the same people with, their very jobs are to discover and keep secrets, and they are almost all presumably capable. Means, motive, and opportunity. And yet, supposedly of the many thousands, none of them has ever done it without express permission from a judge. It would take a massive conspiracy of group think for it not to happen.
Nobody will deny the existence of individual liars and charlatans.