Earlier quoted context omitted.
HN is full of the dilettante type who consider themselves an authority on any field based on a few days of wiki-hopping. I notice this every time I see comments on HN about a topic I actually understand in depth. Quite a few comments are just outright incorrect, most are misguided, but all are confident.
Just because someone posts a comment with their understanding of an issue doesn't mean they consider themselves an authority.
On the other hand, the most confident pronouncements usually come from people unaware of their lack of understanding.