In 1943, the conductor Raphael Schachter, an inmate at the Theresienstadt concentration camp, mounted a performance of Giuseppe Verdi’s Requiem with 150 of his fellow prisoners serving as the chorus. An orchestral performance of the same piece, combined with narration and video and entitled “Defiant Requiem: Verdi at Terezin” has just finished a tour of the U.S. as one of many recent efforts to recreate music produced or performed by Jews during the Holocaust. Matt Lebovic writes of the original Theresienstadt concert:

Theresienstadt’s Council of Jewish Elders—nominally in charge of the ghetto—was vehemently opposed to Schachter’s productions. Not only were Jews performing a Catholic funeral mass, but it was possible the camp’s Nazi rulers would see an act of defiance and deport the entire cast. It was also said that by performing their own funeral mass, the Jewish prisoners were “apologizing for existing.”

To end the debate, Schachter offered each performer the opportunity to bow out of the production, but not one of them did so. After performing the Requiem fifteen times to enraptured audiences, the inmate choir gathered for what would be its final performance on June 23, 1944.

Seated in the front row was Adolf Eichmann . . . and other SS officials. A Red Cross delegation was also in attendance, as part of its mission to vet the camp for signs of genocide. If only in the minds of the imprisoned choir members, Verdi’s funeral mass was used to condemn the Nazi perpetrators watching their Jewish victims perform. As Schachter most famously told his choir, “We will sing to the Nazis what we cannot say to them.”

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.