I guess it all depends on the theory or the conspiracy. I do however believe that some could be true. If one wants to believe that none exist that's fine but don't treat me like a wacko if I choose to believe some.
Since we're on an ex-jw forum, let's take that as an example. Are the JW leadership running a conspiracy? Damn right they are. The conspiracy is to keep members in the dark and suck every penny out of their pockets. Is it working? Yes it is. So if it can work on a small scale like the JWs, it can also work on a much larger scale.
I keep to myself, observe and draw my own conclusions.