Somehow I think rule 14 would be best off as simply "Be nice, or else!", all the things the current rule 14 mention also falls within this one, and it'll cover whatever new irritants posters can invent as well.
It also reflects well back to the (in my memory) rather harmonious time when it was the only rule there was (though the latter half wasn't explicit at the time)

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Trying to make sense of computers, The Error Log.