Furthermore Flagg, think about what would happen in the world, how the world polulation would react on the news that we as humans were here onto this planet together with the primates, in the Pleistocene, that the Darwin's theory is just wrong and that scientists do not know really how the human being showed up on the Earth.
Also Christianity had to accept Darwin's ideas to make sense with scientists in order to give to the common people a starting point for us in this dimension.

These are simple reasons for which, to keep people down, they do not reveal what they know.
The humanity would be panic-striken if knew the reality of the things and The Vatican, to name one among all, would lose its mental power in a matter of a very short time...

Think about.