I actually knew one
hardcore conspiracy theorist when I was in
college (the second time). He droned on and on about all kinds of rather
silly things, like
Hitler is alive and well in
Argentina, and had some
medical work done to de-age him. I enjoyed the
humor of his ideas, but when he started coming to my
dorm room daily to report the latest "true fact", I had to concoct some way to get rid of him.
One evening he stopped by with another load of crap, and I asked him if he noticed he was being followed. I asked him to watch who he visits, lest "they" know who is "in" on all of the "true facts".
That dropped his visits to weekly, and at odd hours of the night.
I then told him to watch out, since "they" must have someone "inside" who is keeping tabs on him. I had followed him that day and noted which dining hall he went to, what classes and what he bought at the bookstore. I recounted this to him, which made his eyes bug out. I thanked him for letting "us" know about what he knew, then turned off a tape recorder I had in a drawer.
He never bothered me again. I did see him twice in the engineering quad, but he turned and ran. I'm sure I lost a few karma points, but it was worth it.