Although Claudine Gay has resigned from her post as president of Harvard University due to revelations of repeated plagiarism, little has so far been done to address the underlying problem of hostility toward Jews on campus. In fact, a social-messaging platform open only to Harvard affiliates has seen a spike in anti-Semitism during the past week. Harry R. Lewis, a professor at the same institution and former undergraduate dean, examines how anti-Semitism became a problem in American higher education, and what can be done about it.

The Harvard online course catalog has a search box. Type in “decolonize.” That word—though surely not the only lens through which to view the current relationship between Europe and the rest of the world—is in the titles of seven courses and the descriptions of eighteen more. Try “oppression” and “liberation.” Each is in the descriptions of more than 80 courses. “Social justice” is in over 100. “White supremacy” and “Enlightenment” are neck and neck, both ahead of “scientific revolution” but behind “intersectionality.”

Though word frequency is an imperfect measure and the precise counts are muddied by duplicate numberings and courses at MIT, this experiment supports the suspicion that the Harvard curriculum has become heavily slanted toward recent fashions of the progressive left.

When complex social and political histories are oversimplified in our teachings as Manichaean struggles—between oppressed people and their oppressors, the powerless and the powerful, the just and the wicked—a veneer of academic respectability is applied to the ugly old stereotype of Jews as evil but deviously successful people.

Professors should not be carrying their ideologies into the classroom. Our job as teachers of “citizens and citizen-leaders” is not to indoctrinate students, but to prepare them to grapple with all of the ideas they will encounter in the societies they will serve. . . . All that is required is for faculty to exhibit some humility about the limits of their own wisdom.

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.