Last week, Max Blumenthal—a professional hater of Israel and the Jews whose father is a sometime confidant of Hillary Clinton—assaulted the memory of Elie Wiesel. While Clinton has privately praised the younger Blumenthal’s work in the past, her campaign responded by condemning his latest outburst. Meanwhile, Donald Trump faced an anti-Semitism scandal of his own. Ben Cohen compares the candidates’ responses:

After retweeting an image sourced to a white-supremacist website that showed a grinning Clinton superimposed onto a pile of money and a Star of David, Trump compounded the offense by blockheadedly sticking to his guns, criticizing his staff for deleting the tweet instead of “defending it.”

At the same time that Trump engages in anti-Semitism denial—something he does every time the issue of his white-supremacist supporters comes up—his campaign pursues the tiresome tactic of putting his Jewish daughter and Jewish son-in-law before the media in his defense. . . .

Except that nobody serious has called Trump an anti-Semite. The charge is that he tolerates anti-Semites and even enables them when it suits him to do so. Citing your Jewish relatives and friends is a favored method of the Israel-haters—“Some of my best friends are Jews!”—and most Jews aren’t fooled by it. They also aren’t fooled by Trump, who further insults our community by insinuating that we’re stupid enough to believe that he understands what constitutes anti-Semitism better than we do.

What both candidates need to do is declare a zero tolerance policy for anti-Semitism around their respective campaigns.

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.