I was going to do more with this, but maybe later. Here's Alan Sokal's web page
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I read the paper Scott Martens links to in the post I mentioned below: "Ideology, Irrationality and Collectively Self-Destructive Behaviour" PDF, and it's a nice simple argument along the lines of one for keeping your head down in a crowd. It undermines any argument for ideology being the sole determining factor for all behavior, but as I said in a comment, it doesn't explain anorexia.