“leftists calling for the murder of Jews?” Leftists? Where do you have that from? Racism, like antisemitism, is mainly a right-wing hang-up! Nazi-Germany’s antisemitism in the 1930’s was highly inspired by racism here in the US, – hardly a “leftist” inspired problem. Check out these books for more on the Nazism in the US:
Rachel Maddow: “Prequel – An American fight against Fascism”
Levitsky and Ziblatt: “Tyranni of the Minority – How Democracies Die.”

You might want to update the latest post to your blog site titled, “Antisemitism – Why?”

Judaism was not “the first more or less organized religion.” That distinction should probably be attributed to Hinduism. Additionally, Judaism did not lead to the “invention of Christianity” as you have suggested. Christ’s followers, about two thousand years ago, established the Christian church based on a belief that Jesus of Nazareth embodied the Old Testament prophecies of a messiah. Even though devout Jews acknowledge Christ as an influential rabbi, they do not accept him as the Messiah mentioned in their ancient texts. The appearance of Christianity did not lead to the creation of Islam. That faith was inspired by Muhammad and a devotion to Abrahamic prophets who lived a thousand or more years before Christ’s ministry.

Your post primarily focused on antisemitism, and you asked, “Can someone explain it, please?” It’s a great question with no single easy answer. In ancient times, mistreatment of Jews was commonly based on ethnic differences. European antisemitism has its roots in religious differences, but today, you will find discrimination against Jews based on racial differences as well as political reasons.

The Hamas incursion into Israel in early October 2023 was despicable and must be condemned in the strongest terms. While the horrors of the Holocaust were perpetrated by the most extreme far right ideology the world has ever seen, today’s slaughter of Jews is supported by the other side of the political spectrum. You ask why do we have antisemitism? At a minimum, it is hatred based on age old cultural differences that is now being played out in the political arena.

Hate speech may be offensive but it is permitted. That being said, should Americans condemn the justification of Hamas’ actions on college campuses? Should there be legal action against leftists calling for the murder of Jews?