Ah, yes, downvoted without responses. To the downvoters: what would you call a strongly held belief that cannot be supported by documentary evidence; a problem

Ah, yes, downvoted without responses. To the downvoters: what would you call a strongly held belief that cannot be supported by documentary evidence; a problem you attribute to a coordinated effort to hide the actors and their intentions? Sounds an awful lot like a theory that there is a conspiracy.