Edit comment? Oh, that would be a great idea, so when you ask someone "are you ok" then the person says "yes" Then you edit and say "did you just fart" Then the person looks stupid..that's a really great idea -.-
I wouldn't want that. When someone says something offensive in a comment, they shouldn't deserve to be able to delete it or edit it. By the time it gets reported, they could have changed it and then the mods wouldn't see anything wrong with it.