Most of us are quite well aware of what we don't know and therefore refrain from talking about it because we don't wanna sound stoopid. Except for one pol. Why?

I guess if you truly believe you know everything, more than the experts in some cases, there is no reason to stifle it. You can pontificate on any subject with a clear conscience. Nothing to prevent you from doing that  when you believe in your heart of hearts that you are the smartest guy in the room as well as the most knowledgeable. The fact that you are among the least smart and most ignorant matters not one bit since that would never be something you would think let alone admit. Full steam ahead!  :)