In weighing its moves, the Israeli government has little choice but to keep in mind sentiments in the U.S., which are shaped in part by the legions of progressives, many of them Jewish, who sympathize with Hamas. “This phenomenon,” write Gary Saul Morson and Morton Schapiro, “is not new.”

Lenin supposedly called people of this sort “useful idiots” and, as the phrase suggests, he had utter contempt for them, especially the liberals of the Kadet (Constitutional Democratic) party. Although they did not themselves practice terrorism, the Kadets apologized for, even applauded, it. . . . No sooner had Lenin seized power than the Bolsheviks proclaimed Kadets “outside the law,” which meant anything could be done to them. Right away two Kadet leaders were murdered in their hospital beds.

In his cycle of novels about the Russian Revolution, Aleksandr Solzhenitsyn poses this very question. In one memorable scene, he describes the novel’s hero, Vorotyntsev, at a meeting of the Kadets. “They were all overwhelmingly certain that they were right, yet they needed these exchanges to reinforce their certainty,” he thinks. And despite his better judgment, Vorotyntsev goes along with them as if he were hypnotized—not because he felt he was wrong, but out of fear of saying something reactionary.”

Today, many are unwilling to risk being called “conservative” or worse, not just to avoid the consequences that such a reputation might entail, but so as not to tarnish their sense of self, which is inextricably tied up with being on the progressive side of everything.

If there is to be peace, Palestinians will have to unlearn the hatred of Israel they have imbibed during nearly two decades of Hamas rule. This will be a difficult task, but Cole Aronson argues, drawing on the experiences of World War II, that Israel has already gotten off to a strong start:

The population’s compliance can . . . be won by a new regime that satisfies its immediate material needs, even if that new regime is sponsored by a government until recently at war with the population’s former regime. Axis civilians were made needy through bombing. Peaceful compliance with the Allies became a good alternative to supporting violent resistance to the Allies.

Israel’s current campaign makes a moderate Gaza more likely, not less. Destroying Hamas not only deprives Islamists of the ability to rule—it proves the futility of armed resistance to Israel, a condition for peace. The destruction of buildings not only deprives Hamas of its hideouts. It also gives ordinary Palestinians strong reasons to shun groups planning to replicate Hamas’s behavior.