Upon further consideration, this is not limited to just the paranormal. Consider, if you will, the physics cranks over in the Science forum. These people people they know things that nobody else knows. They believe they are right and that all of mainstream science is wrong. I'm not sure I've even seen one with a degree in the subject, much less being involved in using this information as part of their career.
Like with paranormal claimants, they lack the ability to state their positions clearly. They ignore tests that prove them wrong. They get very aggressive about it. They see conspiracies to keep this information suppressed. And they come into the lion's den and seem to believe they are shaking up the establishment when in fact nobody is giving them any respect at all. The more they are dismissed, the stronger the attacks. We also see that these people repeat the same pattern on multiple forums, sometimes getting banned before moving elsewhere. Many have done it for years.
I like being right as much as the next guy. I, too, would love to prove the establishment wrong. So would any physicist. Clearly there is some fundamental difference between people like myself and these other people. I really wonder from where it comes.
Yes, it's certainly not limited to just the paranormal. Virtually everything you've mentioned here could be applied to some of those posting in Conspiracy Theories.