What about allowing users to see statistics on how many helpful “unkind” flags have been raised and validated against them? General stats on how many people flagged and how many posts were flagged may be good feedback to help folks understand how their posts are negatively impacting people and might ease some of the burden on moderators if it becomes necessary to do more than warn a user.

We already display stats on how many people our content has reached, but those stats don’t really say whether our impact was perceived as positive or negative.

Just to be clear, only the user and moderators would see these stats. I think making them public would be counter productive.