The ravages of European nonacceptance endure. I see within my own family how the disappearance of a Jewish woman grabbed by Nazis on the streets of Krakow in 1941 can devour her descendants. I understand the rage of an Israeli, Naomi Ragen, whose words were forwarded by a cousin: “And I think of the rest of Europe, who rounded up our grandparents and great-grandparents, and relatives — men, women and children — and sent them off to be gassed, no questions asked. And I think: They are now the moral arbiters of the free world? They are telling the descendants of the people they murdered how to behave when other anti-Semites want to kill them?”

Those anti-Semites would be Hamas, raining terror on Israel, whose annihilation they seek. No state, goes the Israeli case, would not respond with force to such provocation. If there are more than 1,000 Palestinian deaths (including 200 children), and more than 50 Israeli deaths, Israel argues, it is the fault of Hamas, for whom Palestinian victims are the most powerful anti-Israeli argument in the court of world opinion.

I am a Zionist because the story of my forebears convinces me that Jews needed the homeland voted into existence by United Nations Resolution 181 of 1947, calling for the establishment of two states — one Jewish, one Arab — in Mandate Palestine. I am a Zionist who believes in the words of Israel’s founding charter of 1948 declaring that the nascent state would be based “on freedom, justice and peace as envisaged by the prophets of Israel.”

What I cannot accept, however, is the perversion of Zionism that has seen the inexorable growth of a Messianic Israeli nationalism claiming all the land between the Mediterranean and the Jordan River; that has, for almost a half-century now, produced the systematic oppression of another people in the West Bank; that has led to the steady expansion of Israeli settlements on the very West Bank land of any Palestinian state; that isolates moderate Palestinians like Salam Fayyad in the name of divide-and-rule; that pursues policies that will make it impossible to remain a Jewish and democratic state; that seeks tactical advantage rather than the strategic breakthrough of a two-state peace; that blockades Gaza with 1.8 million people locked in its prison and is then surprised by the periodic eruptions of the inmates; and that responds disproportionately to attack in a way that kills hundreds of children.

This, as a Zionist, I cannot accept. Jews, above all people, know what oppression is. Children over millennia were the transmission belt of Jewish survival, the object of what the Israeli novelist Amos Oz and his daughter Fania Oz-Salzberger have called “the intergenerational quizzing that ensures the passing of the torch.” No argument, no Palestinian outrage or subterfuge, can gloss over what Jewish failure the killing of children in such numbers represents.