At a time when Israel is bombing Gaza to try to smash Hamas, it’s worth remembering that Israel itself helped nurture Hamas.

Fred R. Conrad/The New York Times

Nicholas D. Kristof

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Times Topics: Israel | Palestinians | Hamas

When Hamas was founded in 1987, Israel was mostly concerned with Yasser Arafat’s Fatah movement and figured that a religious Palestinian organization would help undermine Fatah. Israel calculated that all those Muslim fundamentalists would spend their time praying in the mosques, so it cracked down on Fatah and allowed Hamas to rise as a counterforce.

What we’re seeing in the Middle East is the Boomerang Syndrome. Arab terrorism built support for right-wing Israeli politicians, who took harsh actions against Palestinians, who responded with more terrorism, and so on. Extremists on each side sustain the other, and the excessive Israeli ground assault in Gaza is likely to create more terrorists in the long run.

If this pattern continues, we may eventually see Hamas-style Palestinians facing off against hard-line Israelis, with each side making the others’ lives wretched — and political moderates in the Middle East politically eviscerated.

I visited Gaza last summer and found many Palestinians ambivalent in a way that Americans and Israelis often don’t appreciate. Many Gazans scorn Fatah as corrupt and incompetent, and they dislike Hamas’s overzealousness and repression. But when they are suffering and humiliated, they find it emotionally satisfying to see Hamas fighting back.

Granted, Israel was profoundly provoked in this case. Israel sought an extension of its cease-fire with Hamas, and Egypt offered to mediate one — but Hamas refused. When it is shelled by its neighbor, Israel has to do something.

But Israel’s right to do something doesn’t mean it has the right to do anything. Since the shelling from Gaza started in 2001, 20 Israeli civilians have been killed by rockets or mortars, according to a tabulation by Israeli human rights groups. That doesn’t justify an all-out ground invasion that has killed more than 660 people (it’s difficult to know how many are militants and how many are civilians).

So what could Israel have reasonably done? Bombing the tunnels through which Gazans smuggle weapons would have been a proportionate response, if Israel had stopped there, and the same is true of airstrikes on certain Hamas targets. An even better approach would have been to ease the siege in Gaza, perhaps creating an environment in which Hamas would have extended the cease-fire. It was certainly worth trying — and almost anything would be better than lashing out in a way that would create more boomerangs.

“This policy is not strengthening Israel,” notes Sari Bashi, the executive director of