Paul Krugman: Sins, Both Moral and Intellectual

When the going gets tough, the people losing the argument start whining about civility. I often find myself attacked as someone who believes that anyone with a different opinion is a fool or a knave. As I've tried to explain, however, this is mainly about selection bias. I don't spend much time on areas where reasonable people can disagree, because there are so many important issues where one side really is completely unreasonable.

Obviously someone can disagree with my side and still be a good person. On the other hand, there are a lot of bad people engaged in economic debate - and I don't mean that they're wrong; I mean that they're arguing in bad faith.