re: Why do so many people on the Left hate Jews?

Because the American left like the right is not monolithic. It’s been pointed out several times that if you poll black people and Hispanic people on most cultural issues they give conservative answers and yet the vote overwhelmingly democrat. Does that make them liberals or leftists or groups of people who believe their group interests are best advanced through the Democratic Party? Ie black and Latino nationalists.

Then you have leftists who hate Israel specifically because they see it as a colonizing force, and leftists who are antisemites because Stalin and the USSR are antisemites.

You get similar break downs on the right between evangelicals (who overwhelmingly make up the Republican Party base and overwhelmingly support Israel) and white nationalists (who don’t have any say within the party itself but do have a lot of the extremely inline youth) who hate Jewish people because they see them as the architects of multiculturalism.