Because “leadership” in anything requiring a democracy requires people to vote for you or at least not actively work against you. This is far from impossible, America’s leadership class heavily overweights Yankees and Jewish people compared to their share of the population but change is always hard. It’s probably a lot harder if there’s a constant drum beat of race talk insisting that X-Americans have a completely different life experience from Y-Americans but it’s not like this is unprecedented. Anti-semitism was widespread across Europe before, during and after Jewish Emancipation and in every country where Hitler and the locals didn’t kill them Jews are over represented in the professional and leadership classes.