Fair enough. I see the theory of that. Does it happen in practice? Are there comments that were intelligent, adding to the discussion, not being mean, and so on... which were then downvoted to the point where they couldn't be seen?
I don't think I've seen it happen on HN, but I have seen it on other sites. I hypothesize that there is actually a craving for intelligent but unusual viewpoints on HN.
I think that differing views add value.
Having contrary opinions just disappear so that everyone can keep restating the same thing to each other is really frustrating.
EDIT: Clarification...