Recently on the question Politely refusing to validate veiled bigotry some of my comments suggesting that the question may be unanswerable and/or not asked in good faith, and should therefore be closed, were silently deleted.
Further comments revealed that at least one other user (@Stacey) was experiencing a similar issue, although I can't say what the content of these comments was, as the deletions were happening very quickly.
It could certainly be argued that the comment threads on that question are right out of hand, and should be deleted/moved to chat, but what seemed to be happening was more along the lines of targeted deletion of content in support of closing the question, while leaving a bunch of pretty rambling discussion in place.
It seems like a mod would be more inclined to go ahead and delete/move all of the comments, so I was wondering whether these comments were removed due to moderator intervention, or user flagging? There doesn't seem to be any way to tell the difference.