In Gaza, Hamas has been fighting groups affiliated with or inspired by Islamic State (IS); in Iraq and Syria, Iran and its proxies have fought IS. But in the Sinai, the local IS branch and its predecessors have long collaborated with Hamas, thanks to funds and materiel provided by Tehran. Arik Agassi explains:

The ongoing cooperation between Hamas and IS in the Sinai began even before Hamas took over Gaza in 2007. It started when Hamas began cultivating relations with Bedouin tribes and Palestinians living in the Sinai. At the time, [what is now the IS branch] was still known by its previous name, Ansar Bait al-Maqdis (ABAM). . . .

The jihadists rightfully saw that Egypt’s hold on the peninsula was weak. As a result, it was a place where they could operate for an extended period of time without risk of being wiped out by Egyptian security forces. Accordingly, ABAM established its headquarters in mountainous areas with no Egyptian presence and extremely difficult conditions on the ground. . . .

Hamas-ABAM cooperation expanded after Israel pulled out of the Gaza Strip, when the smuggling of people, goods, food, weapons, and fuel through tunnels under the Egyptian border into Gaza increased exponentially. . . . In recent months, and especially since November 2014, when ABAM swore allegiance to IS, Hamas has been increasing its clandestine military cooperation with the group. . . .

Through the Iran-Hamas-IS axis, the Sinai branch of what it is now viewed as the world’s most dangerous terrorist group is flush with Tehran’s money, weapons, technology, and expertise. . . . Moreover, Iran has . . . continued arms deliveries to Hamas through the Red Sea and the Sinai even though it must be aware of the fact that IS will take its cut of these shipments as payment for helping smuggle them into the Gaza Strip.

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.