Last week, I looked at the “fashionable, politically correct baloney” of cultural relativism. Relativism is the One Big Idea of Capital-M Multiculturalism. But can we successfully defend its opposite: moral realism?

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Punk rock philosopher. Liberalist contrarian. Grumpy old bastard. I grew up in a generational-Labor-voting family. I kept the faith long after the political left had abandoned it. In the last decade...