It gives people a spurious feeling of being "in on something", "smarter than everyone else", "a rebel".
The simple reason is that when people are unable to explain something they make up a reason for it. Humans naturally want there to be a reason to everything. Since there are many things that couldn't be explained in there day there are many stories about them.
It makes the world seem to make more sense. It just doesn't feel *right* or *balanced* that such a nonentity as Oswald could kill JFK, for example, so people have tried for decades to come up with proof JFK was killed by a Vast Conspiracy. They've had no luck, because that isn't true. It actually was Oswald, and no one else. If there had been a Grassy Knoll gunman, he missed. But there is no reason to think there was one.
Conspiracy theories exist, so yes, they are real. However, they are almost invariably wrong, so no, they are not true.
Many times, paranoia.
There have been conspiracy theories as long as there have been conspiracies, since the beginning of time.
There is no lacking in the evidence of the assassination of JFK. There are many different conspiracy theories, but they are just theories. They all lack sufficient evidence for them to be credible.
The most common conspiracy theories include the assassination of JFK, the death of Elvis Presley, and 911.
Conspiracy theorist, or nut job.
It was my understanding that one of the characters thinks just about everything is a conspiracy theory so is there one specific show, not that I can find.
The television show Mythbusters did a special where they tested the moon landing conspiracy theories. There are also many books and websites which also deal with the subject.
Former Navy Seal, Wrestler, Governor of Minnesota, host of canceled TV show on conspiracy theories
Documentaries - are usually factual programs based around real, hard evidence. Conspiracy theories - are just that - theories based conjecture and supposition.
There are many conspiracy theories concerning WWII involving Hitler, the occult, Nazis, the Illuminati, ect. Google any of the above, it will take a lifetime to read through all of it.
Someone who is interested and/or involved in the creation, analyzing of, or spreading of conspiracy theories.