I had a dream: Israeli Arab students, enraged by the war in Gaza, were protesting at the Hebrew University of Jerusalem. A counterdemonstration by Jewish students erupted. When the head of university security, a Holocaust survivor, tried to intervene, the Arab students called him a Nazi.

Actually, I didn’t dream this. Shlomo Avineri, a political scientist at the university, related the incident. But dreams cut to the quick. There’s no point denying that a line of sorts runs from the dozens killed by Israeli fire near a United Nations school in Gaza back to the Palestinian “Nakba” of 1948 and Berlin 1945.

History is relentless. Sometimes its destructive gyre gets overcome: France and Germany freed themselves after 1945 from war’s cycle. So did Poland and Germany. China and Japan scarcely love each other but do business. Only in the Middle East do the dead rule.

Their demand for blood is, it seems, inexhaustible. Their graves will not be quieted. Since 1948 and Israel’s creation, retribution has reigned between the Jewish and Palestinian national movements.