Even as the massacre at Charlie Hebdo led to enthusiastic expressions of European support for free speech, there has been little discussion of Europe’s draconian (by American standards) limitations on “hate speech” in general and Holocaust denial in particular. And yet, according to Sam Schulman, not only has the effort to prevent “journalists, essayists, and fiction writers from questioning Islam and immigration policy” done nothing to deter or deflect jihadist fury, but proscribing Holocaust denial has failed to curb anti-Semitism, including the murderous kind.

On the latter front, writes Schulman, the evidence is clear. “Twenty years of policing speech about the Holocaust have produced a perverse result”:

In the two countries [the U.S. and UK] in which Holocaust denial is freely available to anyone, the level of Holocaust denial and what might be termed Holocaust skepticism has changed very little. But despite the vigilance and police powers of the regulated-speech countries [France and Germany], the percentage of Holocaust deniers plus skeptics increased substantially, from 5 percent to 26 percent in France and from 8 percent to 11 percent in Germany.

From his inspection of the data, Schulman concludes that “limiting free speech, for noble or ignoble reasons, is an experiment that has been tried and failed.”

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.