In the movie trilogy THE MATRIX, Neo meets The Architect, a program that created the matrix world. After his first two attempts at controlling humans failed, he turned to an intuitive program that learned that humans would accept the matrix if they were given a choice, even at a subconscious level. Only 1% refused the programming. The problem for the Architect was that the 1% would eventually reach a critical mass and could overthrow the machines and free the rest of the humans from the matrix. The Architect realized he had to allow some humans to free themselves of the matrix but still maintain control.
While I don't think the leaders of this world have things down to an exact science, I think they know they have to placate the minds of those who are aware of the truth. So perhaps they know to lose enough ground to keep us in check and on the fringe.