Many Europeans are responding to Israel's repeated aggressions by hating all Jews.

Antisemitism was suppressed for decades because it was condemned by a large part of society, in response to Nazi genocide. My mother told me about the regular antisemitism she experienced in New York in the 1930s, but I have almost never encountered it. (I am Jewish by ethnicity, and the fact that I am an Atheist would not make antisemites forgive me for that.) Now it seems that suppression has ended, antisemitism has come back. Israel's actions are to blame.

It is not rational to condemn all Jews for Israeli aggression. When people with a valid cause attack an illegitimate target, it makes the situation worse. Israel's killing of Arab civilians did that, and antisemitism will do it again.