The biggest conspiracy/dupe/trick is the normalization and manipulation of superstitious thought processes. Humans are naturally superstitious, and as society advances superstitious thinking will be phased out and out grown. It is part of the process of becoming a transhuman species. Humans are naturally susceptible to unscientific and massively subjective/superstitious thinking. This is the root of all evil, because it makes it possible for all other conspiracies/tricks etc. to exist in the first place. The social constructs which are woven into our societal fabric are rooted in the human ability to believe in the intangible, and even let it control their lives. For example any logical human can tell you that the monetary system is like a religion, money is a social construct, doesn't exist.(If you can't understand that, then just think about the actual physical properties of a metal coin or bank note until you realize that "money" has nothing to do with it's chemical make up.) yet we allow corrupt corporations banks and governments to use it to exploit our labor and use all the earths resources for their own gain while 90% of the population plays the "little people" game like a domesticated mule.