" the pseudoscience of the eugenics movement posited that Jews were inferior in their genetic makeup. Some of those who subscribed to this pseudoscientific claim simultaneously argued that Jews possessed not just these inferior traits but superior ones as well. Jews were maliciously intelligent, and because they were able to easily mix with non-Jews, they used those traits to wreak havoc with non-Jews’ lives. That this was a contradiction in terms—simultaneously superior and inferior—presented no problem for the antisemite. "

― Deborah E. Lipstadt , Antisemitism: Here and Now