It's a question of fairness Freerider, if we have a simple (by which I mean no more that 3 or 4 one sentence points) code of conduct we can point to it and say "you have clearly broken this and therefore I'm fully justified in banning you". At the moment, whilst some things are obviously beyond what we'll allow we haven't technically asked anybody to stick to a set of rules.
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To look at a thing is quite different from seeing a thing and one does not see anything until one sees its beauty