The more interesting question is why? Why the false expertise? Why the heir of authority? Why the certainty?. The conversations tend to be extremely emotional and defensive.
I actually don't see too much false expertise, or pretenses of authority, etc. People want to discuss things so they do. If it effects their lives, well, who's to say otherwise? Oh right, some jerk with a blog.
If the treasury department issues 750 billion dollars with my name on it, I'm frankly not much a citizen if I declare my unavoidable ignorance on the matter and so devote myself to my suitable recreations of drinking beer and watching football.