More than likely those who purposefully choose a mule so they can "be free to insult on the forum and not have it come back to them in-game."
Yeah but you assume that people that do that care about being known, infact most trolls are proud of it and are the same ingame, they want to be known. Most of these really hardcore trollers are kept out by being forced into having a valid content id to post.

The problem I have with many that post in this topic is they have no valid argument at all for thier point of view, mule character posters are not raving trolls lashing out at everyone and post many decent additions to the forum. The accusations have very little grounding in the reality of the situation.