At a macro-level there is a robust relationship between population cognitive ability and economic productivity. Redirect Notice
If over time the more educated & intelligent women have fewer children a population becomes less intelligent. (this is something even left wing academic Jim Flynn - of ‘Flynn effect’ fame - has noted. New Paltz Preschool – NYS Licensed Preschool, New Paltz
In relation to a Jewish gene, I think you’ll find that Sarrazin clarified that he was referring to a population genetics paper that was reported in the New York Times in June last year. Sarrazin has pointed out that Germany would be much better off if it had more jewish migrants, and noted they have a higher average iq. Again, he is correct - ashkenazi jews average 2/3 of a standard deviation above other europeans.
As an American, it’s hard to read past the part about the Universal Declaration of Human Rights being “a fundamental component of its politics” and think of them as a “far right” party. Our “left” party (never mind the other) doesn’t in principle embrace all the articles of the UDHR.