@mmcdara You say "On the link https://www.mapleprimes.com/help/moderation there is no mention of a moderator's right to edit another person's response," but that is not my reading of it - it says "please be *very* careful when editing someone’s message," and speaks about "being able to edit your own messages as well [my bold]". I agree it is open to abuse, but as I said that tends to be rare. You need a reputation of 500 to get to moderator, and although that really says nothing absolute about one's ethics, it probably does imply some dedication to the community. I am assuming that if some impoper editing happens, and Maple is made aware of that they can restore a message from a backup.
I'm not in favour of asking an OP if they want to allow a change, since this would allow them to leave copyrighted or offensive material up. I think in many cases where questions and followup answers have suddenly disappeared it is done by the original poster, who has got the answer to their assignment and now wants to remove the evidence of academic misconduct. Sometimes questioners complain, but mostly that is explained by duplicate or similar questions.
- and yes, I was not serious in my comment about your "transgression" since I knew you were being cautious.