And who will go around cleaning those up? Besides, it leaves Michael's name in the history even though he is banned.
Zoe
Well, he WAS a user, even if he is banned. The idea is that we should frustrate him, and not throw in a ton of effort to make the Wikipedia look like he never existed. If he had, for example, created the article [[Jimmy Eat World]] (a band I enjoy), I would still like to write on that subject, even if Michael started it. If he continued to edit it, then of course his changes should be reverted.