Exactly, most of the cover ups that we now know of are carried out with ruthless efficiency, and those are the ones that have been made public for whatever reason.
A small group of people in the past have had all sorts of theories including she never existed can you believe, that and she was cloned from WW2 technology. The mind boggles it really does
When it boils down to it I'm a conspiracy theorist of the first degree concerning everything and anything on initial exposure to the 'evidence' presented. I do go further than that though and read further into it. Disappointingly in almost one hundred percent of cases, few real conspiracy theories stand up to close scrutiny.
There isn't really much excuse for people like Richard Hall to perpetuate myth and misconception. Particularly if it causes harm. I think part of their research must include what goes down well with their target audience and they play to that.
These Madeleine 'experts' seem to promise great expectations ... but in my experience deliver none.