I think we actually strike a pretty good balance. There are clearly large contingents of Apple, Google, and Microsoft fans/employees, all of whom tend to balance each other out. Then there is a large group of younger civil libertarians/libertarians as well as a large group of liberals. And then there is a large group of older, traditional "MIT-style" hackers.
I guess that there is some technophile group think that goes on, and it's true that among the SV contingent, there's a certain amount of ignorance about the state of the country outside of Silicon Valley. But all in all, I think there are enough counterbalancing ideologies and interests here on HN that the hive mind tends not to occur to the same extent as on subreddits, which are by definition single-interest groups.