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It would be interesting to see how well upvote/downvote would work.

Just like here, it would quell community taboo opinions.

If you want to be downvoted to oblivion on HN, just try pointing out potential moral issues with a new technology.

...and the above was instantly downvoted. Communities that use downvotes become blind to self-criticism.

Watch people here flock approvingly around a PG thinkpiece about the value of "unsayable opinions", though. It's like grappling smoke.