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> Eschew flamebait. Don't introduce flamewar topics unless you have something genuinely new to say. Avoid unrelated controversies and generic tangents.
The word "unrelated" is awfully subjective. I could, of course, improve at spelling things out, but one never knows how much elementary illustration is necessary.
Of course, no one believes their own words to be flamebait. Makes the rule about as useful as "don't piss on the escalators"--no one who does it will be dissuaded by a sign.