I agree with other commenters that this is a non-issue unless a post is high-karma or curated, in which case unlisting it would be a bad idea and it should get a disclaimer instead. I’m pretty strongly opposed to “editing the record” in the way you describe in the OP.
(Less opposed to suggestions 2 and 3, though they don’t seem terribly useful.)
I agree with other commenters that this is a non-issue unless a post is high-karma or curated, in which case unlisting it would be a bad idea and it should get a disclaimer instead. I’m pretty strongly opposed to “editing the record” in the way you describe in the OP.
(Less opposed to suggestions 2 and 3, though they don’t seem terribly useful.)