If your argument depends on that one time something happened, you do not have an argument. You have a story. If your argument depends entirely on the so-called slippery slope, you don’t have much of an argument. Everything changes until there’s a reason for it to stop. Mowing your lawn is not a slippery slope to shaving your dog. Coincidences usually mean nothing. And they are the fuel of confirmation bias. If your argument depends entirely on not knowing how else to explain coincidences, you have a poor imagination, not an argument. Coincidences might tell you where to look first for
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