I understand it's the same type of tradeoff, and our dispute is just the magnitude on either side (and hence the proper choice of action). But it's important to recognize, as almost no one who is advocating "ignore" seems to, that you are implicitly imposing a cost on your associates. The fact that people don't freely recognize this is suspicious, but of course not a knock-down argument.
Your spam filters probably catch the occasional false positive. This is pretty much the same tradeoff.