Unless you have met them and carried out a clinical diagnoses then you have just done an armchair diagnoses. 
Um, no. Because it would not be a diagnosis of anything, just an observation of behaviour. (Actually, I have met several conspiracists of various stripes, and while I'd say one is an alcoholic, few of them to my understanding have anything that's been diagnosed by a professional.) It would be a description of behaviour and how that behaviour does and does not fit with the various diagnoses I've heard thrown around. Also why extreme conspiracy belief has made it into the DSM.
Stupidity is defined (albeit by Wikipedia) as "a lack of... ...understanding, reason, wit or sense". That seems to sum up some of the recent hoax believers that we have seen on here. Indeed, many of them would do well to learn Cipollas Laws of Stupidity
- Always and inevitably everyone underestimates the number of stupid individuals in circulation.
- The probability that a certain person (will) be stupid is independent of any other characteristic of that person.
- A stupid person is a person who causes losses to another person or to a group of persons while himself deriving no gain and even possibly incurring losses.
- Non-stupid people always underestimate the damaging power of stupid individuals. In particular non-stupid people constantly forget that at all times and places and under any circumstances to deal and/or associate with stupid people always turns out to be a costly mistake.
- A stupid person is the most dangerous type of person.
That's an extremely broad definition of stupidity; by my thinking, literally everyone fits into it at one point or another. To me, a stupid person must be
incapable of understanding, reasoning, wit, or sense. I seldom believe that conspiracists are incapable of thinking. In fact, we've seen that most of them are actually capable of attaining degrees, holding decent jobs, and so forth. They aren't stupid. (Most of them.) And, by my definition, I've known a stupid Apollo supporter or two over the years, the ones who literally are just parroting what they've heard--the ones who claim that you can see the flag with a backyard telescope. There are points I don't agree with about your laws, too.
I get your point about "hoaxtards", but I don't necessarily agree with it as I consider wilful ignorance as the most cowardly of intellectual failings. I do dislike the phrases "conspiracy theory" and "conspiracy theorists" immensely, as 99.999% of the garbage that they spout would never fit the description of a theory. Heck, most of it barely fits the definition of a hypothesis.
Willful ignorance is pretty vile. But for one thing, it isn't the same as stupidity; some quite intelligent people are willfully ignorant in one field or another, often for reasons that have nothing to do with their intelligence level. For another, if they are genuinely stupid, they aren't willfully ignorant. They are
incapable of losing ignorance, which is sad and not vile. Either way, insulting them won't change their mind. But you'll note I, for one, have stopped using "conspiracy theorist" and starting using "conspiracist" instead, in part because of how misused "theory" is in this context.
