David Icke, mentions this study, in a recent (Jan, 2016) video made by him....
Icke (as have others) blames the CIA for encouraging (or inventing) "debunking"....that the CIA coined the phrase "conspiracy theorists" after the JFK assassination, in an effort to discredit such conspiratorial thinking.
The problem with a conspiracy idea believed to be "true", is that good "evidence" is often not required. Gut or anecdotal feelings often suffices as evidence. Or, these gut feelings are the fuel to make weak evidence seem strong.
Secrets are never revealed....until they are. Then, they're no longer secrets. If they are revealed, the source of the secret-holder needs to be credible, and verifiable.
As conspiracies age with time, MATHS is a tool to estimate a conspiracy possibility....especially given the often human failure of keeping a secret, over time.
Humans:
Modern therapy encourages the patient to reveal secrets, in order to be on the road to self-help and greater happiness.
Alcoholics Anonymous' 12 step program uses confession (admission of wrong) as a key tool toward sobriety.
Accused murders often confess their secrets, wanting to relieve their weighing burden, and become voluntarily and genuinely remorseful.......even though such a confession may lead to their life in prison.