Dang can edit my comments. (He does have to edit comments sometimes, I'm sure, but for reasons you approve of.) I would find it annoying. Until this comment thread, though, I'm not sure I would have considered that dang would get fired for it.
I don't think I nor anyone should be held accountable at work for comments made on Hacker News. If I lost my job over dang editing my post, I would think I worked for a really shit company and nobody went to bat for me. Basically, I would continue believing the interaction on the forum was totally unimportant, and I would be dumbfounded by the idiocy of my manager for elevating it to that a fireable offense, particularly after I let them know I did not make that comment.
FWIW, nobody needs to worry about me. I do not have a boss.