This week the American president was greeted by an especially warm welcome in Saudi Arabia, where dozens of heads of Muslim states were also present. He received a warm if somewhat more qualified reception in Israel. Jonah Goldberg explains Donald Trump’s popularity with Middle Eastern leaders and the pitfalls that lie ahead:

The success . . . of the president’s Middle East trip stands on the ashes of Barack Obama’s failures. It’s easy to forget that for all of Obama’s alleged expertise, his foray into the Middle East foundered on his arrogance and naiveté. In his 2009 Cairo speech, he unspooled clichés as wisdom, thinking that his name alone would put points on the board. He bought into the idea that the road to stability and peace in the Middle East went through Jerusalem.

As Obama learned on the job, he came to believe that the road to peace went through Tehran, crafting an Iranian deal that alienated both our democratic ally Israel and our strategic Sunni allies, chief among them Saudi Arabia. In pursuit of his fantasy, he turned a blind eye to Iran’s crushing of the Green Revolution and dithered to the point of complicity in the Syrian abattoir. Meanwhile, Iran remains as implacably hostile and as determined to be a regional hegemon as ever.

That is the context of Trump’s reception. “Welcome, President Not-Obama!” . . .

Which brings me to Trump’s [own] naiveté when it comes to the Middle East. He manfully called for the destruction of terrorists, but he talked of them as if they were foreign invaders to be driven out of the swamp, not products of it. Like the man who only has a hammer and therefore thinks every problem is a nail, Trump believes that the Middle East’s problems can be solved with terrific “deals.” The Saudis, eager to buy weapons and counter Iran, are all too eager to encourage this view. What alligator doesn’t want sharper teeth?

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.