Earlier quoted context omitted.
A related issue is people downvoting comments that they haven't properly comprehended. Instead of asking "why do you think x" or "do you mean x" they just downvote the comment. Sometimes it happens with controversial comments, even when the controversial comment is based on facts. Sometimes going against HN groupthink (e.g. saying something bad about libertarianism) results in downvotes. EDIT: I'm surprised that I go…
Off topic, but the idea that the HN "groupthink" is libertarian seems ridiculous to me... Other than the NSA stuff which is superficially libertarian, I don't see it at all. The prevailing attitude here is sort of vague lefty-"liberal", basically what you'd expect from, well, a bunch of college students and recent graduates who don't take politics too seriously and live in places like SF and NYC.
I find it a little ironic that your comment was downvoted, even though your comment was a very reasonably presented and valid opinion. I just upvoted you. Another example of the problem with the downvote button.
IMO there is no need at all for a downvote button -- it just causes more problems than it ever solves. Much better to just have a 'flag' button for abusive/inappropriate comments, and an upvote button.