He may be a good psychologist, but he frequently speaks on political issues in which he appears to be consistently misinformed, especially his conception on postmodernism, Marxism and the nature of proof[0].
Postmodernism is a political issue, or at least, it is involved in critical theory which influences politics. Marxism is a critique of political economy. I didn't mean to group the last item in with "political issues", though the point that he is misinformed still stands.