My dad is a self-described "Conspiracy Nut." He has never really shared which conspiracies he truly believed in, other than he was pretty certain that there are "powers that be" that are out to control the world.
I am unsure of the point of a conspiracy theory. Yes, they are meant to illustrate that we aren't privy to the real story and there are strings being pulled that we can't possibly see. There are people that are so power-hungry that they need to control everything.
... but are we ever really in control of our lives?
In the United States, we love to think we are the architects of our own destinies. That isn't true though, is it? Our choices are always dependent on other people choices, and there are almost certainly choices others make that affect us without our desire.