Roger Ebert on rightwing conspiracy theorists

Anyone who is in power is lying to them for evil motives. Nothing they learn from the mainstream media can be trusted. Some people may think they're so smart -- but these conspiracy insiders know the real story. They learn it from each other, they embellish it, they pass it around, they "document" it with invented connections, they bond among themselves, and they live in a closed system that seems to validate them.

They lack common sense. Their conspiracy theories cannot tolerate it. Most reasonable people, when they heard Obama wanted to kill their grandmother, simply smiled, because -- well, because they knew he didn't. But the conspiracy people Know Better. That's the whole point. That's where the fun comes in. They have a peculiar intensity in their circular reasoning. They cite facts that are not facts, supported by authorities who are not authorities.