Shibley Telhami and Steven Kull write: The debate over how to handle Iran’s nuclear program is notable for its gloom and doom. Many people assume that Israel must choose between letting Iran develop nuclear weapons or attacking before it gets the bomb. But this is a false choice. There is a third option: working toward a nuclear weapons-free zone in the Middle East. And it is more feasible than most assume.

Attacking Iran might set its nuclear program back a few years, but it will most likely encourage Iran to aggressively seek — and probably develop — nuclear weapons. Slowing Iran down has some value, but the costs are high and the risks even greater. Iran would almost certainly retaliate, leading to all-out war at a time when Israel is still at odds with various Arab countries, and its relations with Turkey are tense.

Many hawks who argue for war believe that Iran poses an “existential threat” to Israel. They assume Iran is insensitive to the logic of nuclear deterrence and would be prepared to use nuclear weapons without fear of the consequences (which could include killing millions of Palestinians and the loss of millions of Iranian civilians from an inevitable Israeli retaliation). And even if Israel strikes, Iran is still likely to acquire nuclear weapons eventually and would then be even more inclined to use them.

Despite all the talk of an “existential threat,” less than half of Israelis support a strike on Iran. According to our November poll, carried out in cooperation with the Dahaf Institute in Israel, only 43 percent of Israeli Jews support a military strike on Iran — even though 90 percent of them think that Iran will eventually acquire nuclear weapons.

Most important, when asked whether it would be better for both Israel and Iran to have the bomb, or for neither to have it, 65 percent of Israeli Jews said neither. And a remarkable 64 percent favored the idea of a nuclear-free zone, even when it was explained that this would mean Israel giving up its nuclear weapons.

The Israeli public also seems willing to move away from a secretive nuclear policy toward greater openness about Israel’s nuclear facilities. Sixty percent of respondents favored “a system of full international inspections” of all nuclear facilities, including Israel’s and Iran’s, as a step toward regional disarmament.

If Israel’s nuclear program were to become part of the equation, it would be a game-changer. Iran has until now effectively accused the West of employing a double standard because it does not demand Israeli disarmament, earning it many fans across the Arab world.

And a nuclear-free zone may be hard for Iran to refuse. Iranian diplomats have said they would be open to an intrusive role for the United Nations if it accepted Iran’s right to enrich uranium for energy production — not to the higher levels necessary for weapons. And a 2007 poll by the Program on International Policy Attitudes found that the Iranian people would favor such a deal.

We cannot take what Iranian officials say at face value, but an international push for a nuclear-free Middle East would publicly test them. And most Arab leaders would rather not start down the nuclear path — a real risk if Iran gets the bomb — and have therefore welcomed the proposal of a nuclear-free zone.