On the one hand, it is completely unsurprising that Europe has become a swamp of anti-Jewish hostility. It is, after all, Europe. Anti-Jewish hostility has been its metier for centuries. (Yes, the locus of much anti-Jewish activity today is within Europe’s large Muslim-immigrant population; but the young men who threaten their Jewish neighbors draw on the language and traditions of European anti-Semitism as much as they do on Muslim modes of anti-Semitic thought.)
On the other hand, the intensity, and velocity, of anti-Jewish invective—and actual anti-Jewish thuggery—has surprised even Eurocynics such as myself.