Back in the '80s when the Internet "went public" with Usenet News, one of the primary admonitions was to never post anything in anger, because it will be "out there forever". Not long after that, the Preview Button was invented. These remain good things to use.
One can always "report" his/her own post via the little triangle icon, and request deletion by a moderator. Unfortunately, that doesn't delete replies in which our original lapse of sensibility was quoted, however, nor copies archived on other sites. Once we've said something, it is still "out there forever".
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