Often for the sheer fun of it. One reason why more people believe in JFK conspiracy theories than in the 'lone gunman' theory may well be due to an unwillingness to accept that that a deranged ex-Marine/Communist sympathizer with a $40 mail order rifle really could murder a President of the United States.
NO
They're for scaring people who believe conspiracy theories. There are no FEMA death camps.
The name of the group of people who mistrust the government is a conspiracy theorist. These type of people believe in conspiracy theories that the government cover up events on a regular basis.
There's no way to tell if Jesse really believes the conspiracy theories he has on his show or if he's just putting on a show.
Lee Harvey Oswald (unless you believe the conspiracy theories)
There have been conspiracy theories as long as there have been conspiracies, since the beginning of time.
Most people can't resist getting the details on the latest conspiracy theories, goal is to make the world safe for interdependence by protecting the benefits.
Some people believe it was and others believe it was not. There are questions that some people believe the government's report did not answer. There is evidence that some people believe points to the possibility that it was a conspiracy.
People are using birds to spy on us
It is probably just a matter of opinion but I doubt that conspiracy theories have little effect on the government. For many people they don't matter either. For some people though, they offer explainations for things that seem to have no rhyme or reason for certain situations.
The most common conspiracy theories include the assassination of JFK, the death of Elvis Presley, and 911.
Conspiracy theories exist, so yes, they are real. However, they are almost invariably wrong, so no, they are not true.