Except that I've seen legitimate dissenting opinions routinely killed on HN threads, because they go against groupthink. Maybe more people participate, but we'

Except that I've seen legitimate dissenting opinions routinely killed on HN threads, because they go against groupthink. Maybe more people participate, but we're just seeing more of the bulk views, not more diversity of viewpoint, because the people joining are moderates with common views. I, personally, want to optimize freedom of speech to give me the most diversity of exposure -- something I think more aggressive downvoting and moderation stifles.