RE: Four reasons why people believe in conspiracy theories
People conspire all the time. For example: The Bay of Pigs was a conspiracy, (by our very own CIAand President Kennedy). Bank robbers, drug dealers, murderers, rapists, insider traders, con artists, are all examples of people who conspire to do some evil or another.
If you have to use an ad hominem "throw-word" like 'conspiracy nut', at people who think that there is more going on than they are told, it is prima facia evidence that you want to silence them. For whatever reason.