If you are into conspiracies, what would unite this planet into one world government? Let us say a new world order? A threat from space! Alien attack! Create a dog & pony show for world leaders to convince their citizens about a new threat.
The NWO has laid the seeds of doubt about UFOs through out the years. Giving preposterous explanations for UFOs. Cattle mutilations and brainwashed abducttees have laid the groundwork to sucker poor unsuspecting people into the alien theory. Then BANG! We have to protect ourselves from the "aliens". A NWO is born because of a fraudulent enemy.
Yes, I don't know what I'm talking about but it is fun to stir the pot!