Do you want to know when a topic has gotten unrealistically polarized? Curiously, you don't need to know the real truth to see. Ask yourself a simple question: how many obvious points are people not making, compared to how many times people make the same (often weak) points as each other? There's your answer. If a modestly intelligent person can quickly (say, in an hour) find 20 solid, obvious points that no one is making, that's probably because most everyone's blinded into a camp.