[steventruong]

I can see what you mean and I do understand that vantage point of view. However, I think downvoting something just because it doesn't necessarily add obvious value (which is relative) to the conversation is a mistake. Maybe it's just me but I would think it would make people more hesitant to speak freely just because others may perceive no value from it and getting downvoted as a result. It's very different than downvoting something because it's wrong (like 2+2 is not 5) or because the behavior was unacceptable.

[mentat]

As the grandparent says, this is a purposeful decision in this community. There's a goal of encouraging useful conversation, not just conversation. I do a lot less posting than I might otherwise and I make sure my comments have content before posting them. This hesitation helps ensure that I'm providing value, not just rambling opinion. Having an online community built around presenting value really is a feature, not a bug.

[gonehome]

It may be a fine line with some fringe comments being downvoted when perhaps they shouldn't be, but without this it spirals out of control pretty quickly and the entire site becomes useless. Look at the transition that happened to Digg and subsequently Reddit.

These were sites that originally had thoughtful or interesting users that would often be more informative then the content link itself (it's currently like this on HN).

It seems for a while the bad comments get downvoted and removed, but once enough of the community is diluted with a critical mass of 'useless' users, bad comments start being upvoted and the site eventually only consists of the same bad one line jokes, completely devoid of content. At this point most of the old users move somewhere else.