It may be a joke, and I know of no reason to believe it, but unless you can prove it didn't/doesn't happen that way you shouldn't close your mind to the possibility.
I sincerely believe that the system does work that way, or in some manner very much like it, dominated by the international bankers such as those who run the Federal Reserve and other similar private banks operating in every 1st-world nation on the planet. They don't care about distraction (passion-sink) issues like the whole abortion debate, or the flag-burning of yesteryear. But every American President who tried to institute government-issued interest-free currency has been assassinated: Lincoln, Andrew Jackson, and JFK. That's because controlling a nation's currency means you can bring it to its knees without ever firing a single shot. That's real power with little risk, unlike a king or czar who could be overthrown. I believe they actually arrange these events Manchurian Candidate-style, or in the case of Lee Harvey Oswald, they just blame a patsy and invent some ridiculous story.
It amazes me how you can tell someone that a mugger might hurt or even kill for the $50 in a wallet, but if you suggest that powerful men play for keeps and are willing to kill over trillions of dollars and lots of power, then you're some kind of tin foil-hat wearing conspiracy nut. It's as though the media conditions us not to ever seriously consider the possibility, which gets really interesting when you consider there are about five corporations who control everything Americans see on TV, hear on the radio, or read in magazines and newspapers.
I merely temper this belief of mine with the fact that I have no solid proof of it. It is proper for a certain humility and meekness to go with that which you won't see me demonstrate when I know I can prove something. Having said that, I do believe that anyone who seriously looks into the matter with an open mind will come to the same conclusion. Not only will they come to that conclusion, they will realize that it's obvious. The problem is that most people are weak-hearted, intellectually and spiritually timid, and so they only believe what they want to believe and are prepared to believe. That isn't exactly a courageous search for truth.
So no, to more briefly answer your post: I don't easily close my mind to anything. The longer I live, the more I see for myself that some of the most absurd and inconceivable things are actually more true than anything one would consider comfortable and obvious. I wouldn't presume to place artificial limitations on a possibly infinite Universe that no one has begun to understand. It is the height of arrogance to say something can't be true without the ability to soundly falsify it. The farthest one can reasonably go is to say "I really don't know."