I wish I knew.

The best I can offer is that Jews have been a wandering minority in non-Jewish lands (except for Israel) for 2000 years, and minorities are often mistreated. We're scapegoated for whatever the big social problem of the time is perceived to be (killing Christ in early Christianity; spreading plague during the plague; undermining national identity during the age of nationalism; being arch-communists in capitalist countries and arch-capitalists in communist ones; and, most infamously, being racial contaminants (when racial purity was being upheld in Nazi Germany and remains prized among neo-Nazis today). Following this pattern, what is happening for Israel and Jews right now makes sense because for many progressives today, the ultimate evils are white supremacy and colonialism. Even though there's lots of white supremacy and colonialism in the world, the Jewish state becomes the ultimate scapegoat.

I'm not saying Israel's crimes, the occupation, etc. are made up or OK. I've objected to them within the Jewish community, visited Palestine, and made Palestinian friends.

But the implicit antisemitism among progressives is revealed in the free pass given to every other country. It's simply easier to blame and condemn a group that's small and easy to isolate and that people have lots of historical practice hating.

Hope this helps.