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Martin R posted an answer to this question, which was deficient. I posted a comment to the effect that the answer neglected negative values of $x$.

Returning a few hours later, I saw that Martin R had corrected their answer. But my comment was gone! Martin R was as surprised as I was. Why would somebody do this? It feels like a slap in the face.

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    $\begingroup$ Does it show in your "all actions" section in your profile that you did actually comment? The same thing happened with me recently - a comment mysteriously disappeared (at least I did not delete it knowingly), which caused a great deal of confusion. $\endgroup$
    – Srini
    Commented Aug 15 at 21:34
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    $\begingroup$ Maybe someone flagged it as "no longer needed". $\endgroup$
    – Bill Dubuque
    Commented Aug 15 at 21:47
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    $\begingroup$ In principle, comments are supposed to be temporary and are always "at risk" of deletion, if they no longer serve a clarifying role for the answer or question. I also have a mild emotional response when my (friendly, conversational, whatever) comments are deleted, but it is not unusual. But I might suggest you remove the accusatory tone from the question title, and maybe replace it with "why are comments being deleted" (or something) $\endgroup$
    – FShrike
    Commented Aug 15 at 22:29
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    $\begingroup$ @FShrike: my accusatory tone was intentional. There are too many well-meaning moderators who think they are doing the world a good turn by removing constructive (and useful) comments. $\endgroup$
    – TonyK
    Commented Aug 16 at 0:08
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    $\begingroup$ You pointed out a problem. The problem was fixed. The comment should be deleted as it is "no longer needed". This is the correct process and moderator action. Why on earth take it personally that the system worked exactly as intended? $\endgroup$
    – Nij
    Commented Aug 16 at 0:51
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    $\begingroup$ Comments on the SE network are second class citizens, by design. In this case, comments were made suggesting that the answer was incomplete. The answer was edited to correct the omission. The comments, having had the desired effect, were flagged as "no longer needed". A moderator (me) deleted those comments. This is how the site is designed to work. $\endgroup$
    – Xander Henderson Mod
    Commented Aug 16 at 1:02
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    $\begingroup$ I would suggest reviewing math.stackexchange.com/help/privileges/comment . Note that the temporary nature of comments is emphasized. $\endgroup$
    – Xander Henderson Mod
    Commented Aug 16 at 1:04
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    $\begingroup$ @TonyK Consider that outdated correction comments not only take time to read (or to realise are outdated), they are sometimes head-scratching even to peruse. $\endgroup$
    – ryang
    Commented Aug 16 at 4:00
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    $\begingroup$ @XanderHenderson: I agree with everything you said. The only problem that I see if the comments are deleted so quickly then (in this case) TonyK (who wrote the first comment about the flaw in the answer) will not be notified by the second comment that the answer is fixed, so that they can evaluate the answer again. $\endgroup$
    – Martin R
    Commented Aug 16 at 4:54

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