But why did Hitler pick Jews? And why was tbe public so receptive?

Completely unrelated quote from Wikipedia’s article about antisemitism:

The Enlightenment adopted some anti-Judaic stereotypes, such as the juxtaposition of a supposedly nationally limited and materialistic Jewish religion of hate against a universal and idealistic Christian religion of love. In the 19th century, Christian and racist hostility toward Jews merged. Thus, Christian and racist enemies of Jews together revived the medieval ritual murder legends. Since 1900, nationalist Christians were at the same time anti-Semites, such as the Protestant church party “German Christians” of the Nazi era.