I'm not to sure how to quote you gillianren, but I'll work it out.
You click on the Quote link at the upper right of each post and then work your way through the HTML-but-not-quite tags that get dumped into the text area.
What I don't understand is why certain people don't have a thirst for knowledge.
Often they do, but they lack the time, the means, or the ability to obtain it. Conspiracy theories then become a sort of shortcut to the illusion of erudition for some people. They make the claimant seem well-informed if for some reason the real information comes hard to him.
Paradoxically, many conspiracy theorists use their theories for ego-reinforcement by tearing away at the Establishment that rejected them. Rather than work hard and try to acquire the knowledge they lack, which just makes them one face among thousands, they lash out in resentment with accusatory ignorance, which makes them stand out as noisy celebrities. It's not scholarship. It's an egotistical, arrogant ploy for constant attention and validation.
I don't feel smart. I had the opportunity to apply for Mensa but declined due to my own insecurity.
You're not missing much. I was a member for a few years, but then realized they are largely the kind of people who can talk your ear off about hyperspatial manifolds, then go out to the car and pour the oil in their radiators instead of the crankcase. In the subsequent years I've learned that thinking critically is a more valuable skill than the kind of stuff Mensa tests you on. I worked as a contract engineer on the Boeing 777 and the Boeing 787 projects (oddly enough in very different roles), but I've probably learned more about jet engines from watching Agent JZ on YouTube than I ever did from my actual professional training.
Your insecurity is unfounded. From what you've written so far here, you come across quite intelligent and witty.
I see the current trend of conspiracies and suspicion of everything scientific, medicinal, and governmental, to a lesser degree, a world wide dumming down.
Indeed. There's the idea of a healthy degree of suspicion that keeps unscrupulous people from doing bad things. But there's a growing anti-science movement that I have a hard time figuring out.