The worst is users with the ability to flag content.

I have dead comments turned on and see a lot of well-made thought provoking comments that that are flagged because they are contrary to the popular narrative.

On the other hand there are a lot of bad comments that deserve to be flagged so it's a double-edged sword.

I've resurrected quite a few of these; note that with flagging rights comes also the "vouch" button to keep the discourse more balanced.

Would be interested to learn the proportion of flagged:vouched comments.

How much karma is needed before flag and vouch are available?