Why haven't our liberal American Jews learned from our brethren in Europe, facing massive anti-Semitism from their Muslim immigrants?

Why haven't our liberal American Jews learned from our brethren in Europe, facing massive anti-Semitism from their Muslim immigrants? Headlines today and recently

1. Famously tolerant Dutch faced with growing

population of antisemitic Muslim immigrants http://www.worldjewishdaily.com/holland-antisemitism.php

2.Antisemitism Continues in Britain

Beware of Jews’ Sign Near London Synagogue Reported to Police

Graffiti at Sussex University: 'Jet fuel can’t melt Jews. Holocaust was an inside job.'

And in Canada

Israel-hating students at Ontario University compare Jews to rodents on Facebook

3. 80% European Jews were afraid to go to High Holidays this year

4. Swedish Jews live in fear

and in USA, Feminist anti trump marches organized by Jew hating Muslim radicals, and our college kids are under assault from radical Muslim student groups but Jews don't care, but still, Jews are desperate to bring in more anti-Semites, from nations that AVERAGE 74% anti-Semites.