A old wanted poster for Osama bin Laden. His death in 2011 has been the subject of contradictory conspiracy theories.

Did Princess Diana fake her own death to escape the public eye? Or was she killed by a rogue element of the British secret service?

If you agree with one of these theories, there's a good chance you'll subscribe to both even though one suggests Princess Diana is alive, the other dead, a new study indicates.

It's known that people who believe one conspiracy theory are inclined to endorse others as well. But new research shows that conspiracy theorists aren't put off by contradictory theories and offers a reason why.

"They're explained by the overarching theory that there is some kind of cover-up, that authorities are withholding information from us," said Karen Douglas, a study researcher and reader in the school of psychology sciences at the University of Kent in the United Kingdom. "It's not that people are gullible or silly by having those beliefs. … It all fits into the same picture."  [Is This Article Part of a Conspiracy?]