I understood your intent - this place really, really needs the ability to edit a comment. Give the author 5-10 minutes after the initial post to come back and edit the verbiage. After that time the post is cast in stone.
Nah, I’ve started some of my most interesting flame wars that way. It would cut into the sale of asbestos undies too much.
Or, alternatively, give contributing members the ability to edit, as one board I know does.