I think that some people are naturally conspiratorial because <insert explanation that involves neurotransmitters>. My acquaintance's condition is also exacerbated by an emotional need to set himself apart from the herd (which is also quite common). Having privileged access to the 'truth' means that you're somehow better and that everyone else is a normie moron.
Correct. I remember one CEO telling me that ~10% of your customers will always find a reason to be unhappy with your product, and that you should basically give them the bum's rush.*** Not every sparrow is saved. ***