Born in the Polish town of Kamionka in 1922, Frank Blaichman died last month in his Manhattan home. In 1942, three years after the start of the Nazi occupation, Blaichman fled Kamionka for the forests, where he found fellow Jews eager to fight back against the Third Reich. Neil Genzlinger writes:

[Blaichman soon] organized a defense force, though at first its main weapon was illusion created with pitchforks. “We broke off all the teeth, left one tooth on, and put a strap on the shoulder,” he said in [his] oral history. “From far away it looked like a rifle.”

Illusion of a sort also helped them acquire real weapons in the winter of 1942-43. His group learned of a farmer who had a stash of guns. He and another man went to see the farmer and convinced him that they were Russian paratroopers under orders to establish a resistance unit to battle the Germans. The ruse worked. “When we headed back to the forest, we had eight weapons,” Mr. Blaichman wrote. “Finally we could defend ourselves.”

The group grew more sophisticated and better armed, and Blaichman eventually commanded more than 100 armed Jewish partisans. His group linked up with other Jewish partisans, as well as groups like the [Polish] Communist partisan force Armia Ludowa, and spent the war disrupting German supply lines and communications and ferreting out Poles who were collaborating with the Nazis.

After the war Blaichman was assigned to the Polish Security Police, a unit of Poland’s new government, and given the job of tracking down Nazi collaborators. [In his memoir], Blaichman [depicted] certain other resistance groups as being severely anti-Semitic. That anti-Semitism . . . continued in postwar Poland. “As part of my job, I had interviewed many Poles who, unaware that I was a Jew, made no attempt to conceal their feelings about Jews,” he wrote. “As a result, I had come to realize the depth of Polish anti-Semitism.”

Blaichman and his wife, also a partisan veteran, quickly decided Poland was no place for Jews and emigrated to the U.S. Besides writing a book about his experiences, he was also active in efforts to commemorate Jewish resistance, and was instrumental in the creation of Jerusalem’s memorial to the partisans.

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.