This week, Donald Trump made some disparaging remarks about Al Sharpton, leading the candidates for the Democratic presidential nomination to rush to praise this notorious race-baiter who twice incited deadly violence against Orthodox Jews in New York City. Seth Mandel takes them to task for following the now-standard political principle of “the enemy of my enemy is my infallible hero”:

Sharpton is unworthy of such praise, so much so that the decision to back him reflexively is a massive moral demerit. Calling Sharpton a lifelong fighter for “justice,” [as did Elizabeth Warren], ignores his history of race-baiting and deadly anti-Semitic incitement.

Sharpton [remains] free of shame or apology. “You only repent when you mean it, and I have done nothing wrong,” he insisted years [after the murders he encouraged in the 1990s]. In 2011, he wrote a gobsmacking piece of revisionist history for the New York Daily News, claiming his remarks were being manipulated by “extremist Jews.” [Evidently], Sharpton doesn’t think he’s getting enough credit for his behavior.

[But] at Wednesday night’s Democratic presidential debate, no one asked [Elizabeth] Warren about Sharpton’s record or the message she might be sending with such full-blown praise. Nor was Pete Buttigieg—who has struck up a very public alliance with Sharpton in an attempt to burnish his standing with black voters—prodded about the hypocrisy on display. Republicans, Buttigieg lectured, “are supporting naked racism in the White House, or at best silent about it.” . . . What would Buttigieg say about his own support for a public figure with a long history of bigotry? We don’t know, because no one thought to ask him at the debate. (I have repeatedly asked his campaign for comment, to no avail.)

We are routinely told that harsh criticism of minority members of Congress amounts to incitement to violence. What of Sharpton, who initially made his career out of explicit incitement to violence? [These days] this is no idle concern.

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.