Simple logic and looking into the U.S goverment can disprove almost all of them. They are simply people either being to distrusting or paranoid. Seriously look at half the stupid shit out there. This conspiracy theroy is big enough to be put on Wikipedia where a lot are left off of the main list
I'm sorry but with over a ton of these it is hard to argue with idiocy.Evil aliens
See also: Alien invasion
A somewhat different version of this theory maintains that humanity is actually under the control of shape-shifting alien reptiles, who require periodic ingestion of human blood to maintain their human appearance. David Icke has been a devoted proponent of this theory.[72] According to Icke, the Bush family and the British Royal Family are actually such creatures, and Diana, Princess of Wales was aware of this, presumably relating to her death.[72] David Icke's theory, which encompasses many other conspiracy theories, is that humanity is actually under the reptilians; with evidence ranging from Sumerian tablets describing the "Anunnaki" (which he translates as "those who from heaven to earth came"), to the serpent in the Biblical Garden of Eden, to child abuse and water fluoridation.