I'd say HN is actually very mixed. See this discussion as an example where the only three comments are downvoted: https://news.ycombinator.com/item?id=7831778
There seem to be anarcho-capitalist, social-green-leftist, pro-state surveillance, anti-state surveillance, pro-(progressive-)tax people, voluntarists, etc.
I am sometimes offended or even horrified by some of the views expressed (like the surveillance apologists, or drone-war fascists), but overall I think HN diversity is a good thing. Only group bias is towards tech.