Still, unfortunately, relevant is Bernard Lewis's brilliant article from the December 2005 American Scholar, "The New Anti-Semitism." It's worth reading in full, but the part I found particularly resonant was this, on how Jew-hating serves two purposes, one for disloyal Jews and one for non-Jews:
In anti-Semitism's first stage, when the hostility was based in religion and expressed in religious terms, the Jew always had the option of changing sides. During the medieval and early modern periods, Jews persecuted by Christians could convert. Not only could they escape the persecution; they could join the persecutors if they so wished, and some indeed rose to high rank in the church and in the Inquisition. Racial anti-Semitism removed that option. The present-day ideological anti-Semitism has restored it, and now as in the Middle Ages, there seem to be some who are willing to avail themselves of this option.
For non-Jews the rationale brought a different kind of relief. For more than half a century, any discussion of Jews and their problems has been overshadowed by the grim memories of the crimes of the Nazis and of the complicity, acquiescence, or indifference of so many others. But inevitably, the memory of those days is fading, and now Israel and its problems afford an opportunity to relinquish the unfamiliar and uncomfortable posture of guilt and contrition and to resume the more familiar and more comfortable position of stern reproof from an attitude of moral superiority. It is not surprising that this opportunity is widely welcomed and utilized.