I am a member of many SE sites, and I have limited mod powers on some of them. It seems as though every negative action taken by a mod (vote to close, etc.) must be justified. Why then can any random user^ unaccountably downvote any question or answer?
I think downvotes should be explained, and bad downvotes should themselves be downvoted into oblivion, or good ones upvoted to show consensus. Otherwise it's difficult or impossible for the OP to know what to improve unless someone also posts a comment, which is rare. Having a few defaults (such as with vote to close) gets around the problem of people just typing "dfkjjf" into a comment box.
That said, is downvoting the only negative unaccountable feature? If so, why?
^ with 125 reputation or more