You seem to have missed an earlier part of my comment. Because HN requires very high karma thresholds before enabling downvotes, net points are an extremely asymmetric measure.

However, one possible solution would be to enable downvotes, but only on controversial posts such as Gruber's. That would enable both sides of the community to speak.

How would you feel about such a measure?

EDIT: Controversial might be defined objectively as the ratio of upvotes to flags, or similar. People regularly comment on the fact that they have flagged Gruber's posts, but I presume that moderators currently just ignore such flags because the content isn't offensive, against the rules, and so on. For that matter, it would be interesting to know how many flags are currently on this post.