I wouldn’t, because I’m a warts and all kinda guy. I agree with Simone Runyan that adding a postscript is probably a good thing. I’m quite uncomfortable with deleting things in general—although Quora is very comfortable with it, which is why they reject crawlers from archive.org.
Bear in mind that Quora does not often pop old material up in people’s feed. If you have a reasonable volume of answers, people likely have to go hunting to find it.
And, well, as W said: “When I was young and foolish, I was young and foolish.”