As he sits in Geneva, Michel Dreifuss does not feel all that far away from the Hamas attack on Israel on Oct. 7 and Israel's subsequent bombardment of Gaza. The ripples are rolling through Europe and upending assumptions both global and intimate — including those about his personal safety as a Jew. "Yesterday I bought a tear-gas spray canister at a military-equipment surplus store," the 64-year-old retired tech sector worker said recently at a rally to mark a month since the Hamas killings. The choice, he says, is a "precaution," driven by a surge of antisemitism in Europe. Last month's slayings of about 1,200 people in Israel by armed Palestinian militants represented the biggest killing of Jews since the Holocaust. The fallout from it, and from Israel's intense military response that health officials in Hamas-controlled Gaza say has killed at least 13,300 Palestinians, has extended to Europe. In doing so, it has shaken a continent all too familiar with deadly anti-Jewish hatred for