It is a reasonable line of thought, you know. Perfect planking warrants a ban, but isn't discrete nor enforceable, whereas MK fits the criteria for being discrete and enforceable for a ban, but we're not necessarily sure whether or not he warrants it(of course, I personally think he does, but that's another thing).
Banning MK fits all three criteria for banning MK's perfect planking. Perfect planking warrants a ban, so removing MK would do just that, and a rule regarding non-use of MK is both discrete and enforceable.
Edit: Inferno, BPC, and anyone else heavily involved in these matters, I'd like to hear your opinions on this post and
my previous post(<-- Click there to go to it).