alt Hacker Newshe was referring to the famous DNA research, mentioned in this Israeli newspaper:
Scientists Discover Gene That Predisposes Ashkenazi Jews to Schizophrenia
Variations of the DNST3 gene make Ashkenazi Jews 40 percent more likely to develop schizophrenia and similar diseases.
No. Jews having 40% higher chances of schizophrenia in no way justifies the view that most Jews are lunatics. It’s a minuscule chance to begin with. Saying “most Jews are lunatics” is just antisemitic.