Last month the German commissioner for “Jewish Life in Germany and the Fight Against Antisemitism” used his impressively titled office to advise German Jews against wearing kipahs in public. The commissioner's response to a surge of anti-Semitic violence in his country was a sheepish acknowledgment that Germany is once again a dangerous country for Jews. And as Germany goes, so goes Europe. For millennia, following the destruction of the Second Temple and the beginning of the diaspora, Europe was home to the majority of the world's Jews. That chapter of history is over. The continent is fast becoming a land of Jewish ghost towns and graveyards where the few remaining Jews must either accept an embattled existence or else are preparing to leave.