Well, it's like with "propaganda". All Western countries did "propaganda" until the 1930s, when they decided that only Germans did propaganda, whereas what they did was "information". Around the same time they decided that only Fascists used the "Roman salute" whereas what they used was - whatever. And around the same time they decided that only Nazis believed in "races", whereas they believed in - whatever.
This is what I call "dissimilation", the urgent need to look, in times of conflict, as unsimilar as possible to your opponent. A kind of stupidization.
Ashkenazi Jews are, for all we know, a distinct biological-genetical group. "Distinct" means that scientists can distinguish them. The genetical distinctness implies advantages, w.r.t. IQ, but even more w.r.t. verbal skills. But verbal skills are a problematic gift: they allow someone to deceive others, but to deceive himself as well. This affects social competence in a negative way.