Americans have always been very conspiracy minded. Only Arabs are more so. If something seems "odd", Americans will invent a conspiracy to explain it, and the more intricate and improbable the conspiracy the better. Even worse, the conspiracy theory never collapses under its own weight and idiocy, but only gains strength. A majority of Americans believe that their government is hiding the truth about UFOs and extraterrestrial visitation, and that President John F. Kennedy was killed by a byzantine conspiracy, although they can't agree on who did it.
Smaller numbers believe in the existence of the "Illuminati" or a similar group, and that this group controls the world and has plotted for millenia to do...well they can't agree on what this group's goal is, but it usually has to do with establishing a totalitarian state, one where the individual will have all independent thinking capability robbed from him and be turned into a robot.
Americans are very worried that technology will allow their rulers to in effect turn off the human brain and make them into zombies. Science fiction movies in which the populace has been turned into zombies and a few lonely souls have escaped to fight on are eternally popular here. The idea of a zombie, a carbon robot, actually comes from West Africa via the Caribbean, but it has an unbelievable hold on the popular imagination. A zombie is not possessed by a demon, he has had his brain turned off and is not capable of thinking for himself. This concept is not found in Europe or in Australia, unless it has been imported there via America.