What you don't know is that, much like the Foundation needed the Second Foundation, the Illuminati also have a pyramidal structure and are themselves controlled by a force too powerful for them to fight, and whose destruction would be too terrible to contemplate even if they could be defeated. At the top of this "Second Illuminati" (they have no real name, as they are such a singular organization that they need none) is a mysterious figure known only as "Bobby Joe" who controls the destiny of humanity for a term of 5 years, always ending on his 18th birthday. As the 18th birthday of the current Bobby Joe approaches, a new "Bobby Joe" is selected by the Second Illuminati and, on his birthday proper, the then current Bobby Joe is lobotomized.
OPEN YOUR EYES PEOPLE! Learn the truth!
The only reason we know anything about the Illuminati is that their masters *let* us know!