hypervalent_iodine

Well, yes. That much should have been fairly obvious given the fact that a.) I didn't say this comment in particular is what made him incompetent and, b.) my subsequent analogies.

D-K does not necessarily prevent someone to learn, though. It just means that the person incorrectly assess own and other's competence in a given field. Coupled with an inability to learn is quite devastating, though.

I think one naturally follows from the other. If you're convinced that you're better than you actually are, it's reasonable that you aren't going to assess mistakes as being your fault / responsibility and something to learn from.