We recently had a question that appeared on HNQ and got an answer that was factually wrong but got 10+ upvotes. I downvoted and commented to explain that it was wrong; several other people downvoted. I and another user posted (what I believe to be) factually correct answers, which were upvoted and both collected more votes than the original wrong answer. (Yay! First time I've seen this really work on SE.)
However, since then, a user has edited the wrong answer and made it correct. Is this appropriate?
(I have an opinion about this, which I've put in an answer.)