"[A]nti-Semitism is like alcoholism. You can go for 25 years without a drink, but if things go bad and you find yourself with a vodka in your hand, you can’t get rid of it."
The quote is from the International Herald Tribune on August 11th, 2003, but I found it in this Dissent article by Mitchell Cohen: "Anti-Semitism and the Left that Doesn't Learn."
Even if anti-Semitism is in remission in some places in the world, that doesn't mean we've kicked the habit. As we've seen, the age-old prejudice has its own regenerative abilities that allow it to come roaring back after prolonged (supposed) absence.