Considering the troubling increase in anti-Semitic violence in the U.S., and the revival of anti-Semitic politics, Jonathan Sacks writes:

The far left has not recovered from the global collapse of Communism and socialism as ideologies. Hence the assault on Jews as capitalists and libertarians. The far right feels threatened by the changing composition of Western societies, because of immigration on an unprecedented scale and low birthrates among the native population. Hence white supremacists. Many radical Islamists are troubled by dysfunctions in the Muslim world. Hence the emergence of anti-Zionism as the new anti-Semitism.

The scapegoat of choice has long been the Jews. They were the archetypal outsiders. For a thousand years, they were the most prominent non-Christian minority in Europe. Today, the state of Israel is the most significant non-Muslim presence in the Middle East. It is easy to blame Jews because they are conspicuous, because they are a minority, and because they are there. Anti-Semitism has little to do with Jews—they are its object, not its cause—and everything to do with dysfunction in the communities that harbor it.

Anti-Semitism . . . becomes dangerous in any society when three things happen: when it moves from the fringes of politics to a mainstream party and its leadership; when the party sees that its popularity with the general public is not harmed thereby; and when those who stand up and protest are vilified and abused for doing so.

All three factors exist in Britain now. The same must not be allowed to happen in America.

Two extraordinary events demonstrate something important about Israel’s most fervent adversaries. One was a speech given at something called The People’s Forum (funded generously by Goldman Sachs), which stated, “When the state of Israel is finally destroyed and erased from history, that will be the single most important blow we can give to destroying capitalism and imperialism.”

The suggestion that this tiny state is the linchpin of a global, centuries-old phenomenon like capitalism goes well beyond anything resembling rational criticism. Even if Israel were guilty of genocide, apartheid, and oppression—which of course it is not—it would not follow that its destruction would help end capitalism or imperialism.

The other was an anti-Israel protest that took place in front of New York City’s Memorial Sloan Kettering Cancer Center, deemed “complicit” in Israel’s evils. At organizers’ urging, participants shouted their slogans at kids in the cancer ward, who were watching from the windows. Given Hamas’s indifference toward the lives of Gazan children, such callousness toward non-Palestinian children from Hamas’s Western allies shouldn’t be surprising. The protest—like the abovementioned speech—deliberately conveyed the message that Israel is the ultimate evil and its destruction the ultimate good, cancer patients be damned.

The fact that Israel’s adversaries are almost comically perverse does not mean that they can be dismissed. If its allies fail to understand the obsessive and irrational hatred that it faces, they cannot effectively help it defend itself.