Cultural relativism is an ancient idea enjoying a new vogue. No matter that it’s as weak and contradictory now as it was for the Greeks. But, like many weak and contradictory ideas, it’s still a useful brickbat for activists.

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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...