Rather, a "conspiracy theory" is a conspiracy theory that the speaker wishes to ridicule.
I don't think this is accurate.
What characterizes the things generally called "conspiracy theories" is not only that the people talking about them want to ridicule them. They also tend to have the following features not widely shared by more credible theories with conspiracies in:
So, for instance, "9-11 truthers" can't (e.g.) point to leaked government memos saying "let's fly planes into buildings and say it was terrorists"; rather, AIUI they argue that (1) the "usual" explanations are no good because being hit by a plane can't actually cause a building to collapse as the WTC towers did and (2) that means the government is covering something up so they probably planned it all. This theory requires that a whole lot of people in the US government knowingly betrayed their country and killed thousands of innocent people, and did it without getting caught, and no one involved blew the whistle.
Obviously, any false theory isn't going to be adequately supported by the facts. But I dispute that they necessarily have any pattern of features, and I suggest any apparent pattern is more read in by people trying to denigrate.
For example, why would a 9-11 conspiracy require a massive number of government operatives to know? Obviously, it could have been carried out by a small terrorist cell taking over commercial airliners - a conspiracy only requires a single government agent telling them to do it. Now, in the absence of specific information, Ockhams Ra...
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