No idea what "ninja editing" is, but perhaps you know what "snitch jacketing" is? That's when you start making insinuations about people because you disagree with them. Almost as pathetic as accusing them of being bots.
Who cares? Well, if someone is trying to reply to you, you can make their reply look like a lie or off topic (whether deliberately or not).
This gives you a problem if you decide that you overstated your case, or that you were too harsh. Do you edit in a way that removes what you said that was too harsh or too strong, or do you leave it, thereby leaving what is going to trigger hostile responses? The best way to do it might be to remove it, and add "[Edit: Removed inflammatory language.]" or something similar.