4chan

I have a direct example of this:

I was at the UFO museum in Roswell, NM and the guy that was giving a talk was a self-described Ufologist and this was after the government released the UFO footage. He talked the whole time about government coverup of past UFO crashes, etc.

In the Q&A, someone asked if the recent footage gave him hope that we'll begin to learn more about UFOs now that the government seems more forthright with the information... And he got pissed at them for even asking. It was as if his whole retirement activity of uncovering conspiracies was challenged and his brain couldn't handle it except by getting angry at an honest question.

His conspiracy seemed to be more boring than he thought (and spent decades "researching") so he wouldn't allow the truth to shatter it. It was fascinating to see in real-time.