This was not random sampling of opinion out of a large universe. Rather, it involved pre-selection.
Adolph Hitler indulged in this sort of research for the purpose of justifying his own prejudices. The fact that the nutcases at Berkeley would indulge in Hitlerian analysis is no longer surprising. Even anti-semitism is once again in vogue with the leftwing. These guys will be justifying the resurrection of human sacrifice before long, and this will all look like small potatoes in retrospect.
Uh-huh.