Originally Posted by
RCLefty
..but not this. In fact, a population as large as our could easily sustain delusion. It happens all the time. It's called "Groupthink."
Before I go farther, I want to take time to define the term "delusion."
Delusion simply means "a fixed belief that is either false, fanciful, or derived from deception." It doesn't mean you have a psychological condition, that you are experiencing hallucinations, or that there is anything mentally "wrong" with you, at all, apart from having an incorrect belief.
To apply it here, lets say that instead of being a lucid dreaming forum, this was a homeopathy forum. Everyone is here because they are an enthusiastic user or provider of homeopathic preparations.
Groupthink would assert itself in the form of us, as a group, ignoring or rationalizing away evidence which contradicts the claims of homeopathy, and placing undo focus or faulty perspective on information that seems to support it.
We would all have stories of our "successful" treatments of illnesses with homeopathy, as well as stories of failed attempts to do so, and those failures would be treated as evidence of incorrect application, rather than as evidence that the phenomenon is bunk.
Occasionally, individuals would get access to better information and stray from the flock, but on the whole, the community would continue to sustain itself indefinitely. In fact, the delusion itself would probably outlast the community. The website would be far more likely to die a slow death of disinterest, or suffer some server issues that disrupt the relationships to a point where they cannot easily recover, or something like that than to have everyone become disillusioned.
And you can't expect the media to do the job, either; the research proving that homeopathy doesn't work is well-documented and freely available, and yet communities of believers sustain themselves quite readily in spite of this.
The same is true for people who believe they have exorcised demons, people who believe they have been abducted by aliens, people who believe all sorts of other things.
A word on demons and aliens abductions, in particular. Both of these ideas come from the intersection of normal personal phenomena (sleep paralysis, in both cases) with cultural archetypes (evil spirits, and extraterrestrial beings, respectively. In fact, you can trace the relative decline of the former to the ascendance of the latter. It's almost as if aliens didn't achieve the technology to reach Earth until we learned enough about the universe to conceptualize the possibility of aliens.)
When we fail to adequately appreciate the ease with which our sense of reality can be compromised, we leave ourselves open to all sorts of delusions.