Israel's 'Iron Dome' system isn't enough protection
March 12, 2012 -- Updated 1924 GMT (0324 HKT)
Editor's note: David Frum, a CNN contributor, is a contributing editor at Newsweek and The Daily Beast. He was a special assistant to President George W. Bush from 2001 to 2002 and is the author of six books, including "Comeback: Conservatism That Can Win Again."
(CNN) -- As Iran rushes ahead with its nuclear program, some foreign policy thinkers urge Israel to accept that it must live with "incomplete" security.
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Israel has met the barrage with a new defense system, named Iron Dome.
David Frum
Iron Dome senses rocket launches. Its computers assess which rockets are headed toward populated areas, then it fires missiles to intercept the incoming rockets.
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According to the Israel Defense Forces, Iron Dome has achieved a success rate of more than 90% when fired. Since Friday, Palestinian militants have fired more than 170 rockets at Israeli cities, but as yet, no Israeli civilians have been killed.
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Since 2001, Israel has responded to attacks by deploying ever-more effective technological systems: first the security fence to halt the entry of suicide bombers; now Iron Dome to stop short-range rockets; and in time, the Arrow anti-ballistic missile system against longer-range missiles.
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These innovations have defeated and deterred violence and saved many lives.
But these innovations are also subject to inherent weaknesses.
The rockets launched from Gaza are armed only with explosives and shrapnel. When Iron Dome misses -- and it does sometimes miss -- the Gaza rockets kill and maim only within a very limited radius.
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The fence also fails sometimes. Last year for example, a British citizen was killed and 50 people wounded by a suicide bombing near the Jerusalem convention center. Yet as with the Gaza rockets, the lethality of suicide bombings is inherently limited. Israel does not need to reach 100% success to defeat the terrorism threat.
Suppose, however, that the rockets carried nuclear payloads, or that the suicide bombers had access to radioactive materials. Then a 90% success rate would not nearly suffice.
-Iran's nuclear program threatens to upend the strategic calculus of the past decade, to overwhelm all Israeli countermeasures to protect Israel's population.
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A nuclearized Iran does not imply "incomplete" security for Israel. It would expose Israel to absolute insecurity.
As rockets fly toward southern Israel, the rest of Israel carries on. The economy produces and thrives.
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A relative of mine, visiting Jerusalem, comments that if she were not reading about the rockets in the newspapers, she would not know they were being fired.
Yet even the threat of a mass-casualty event would paralyze the Israeli economy.
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People would avoid downtowns, visitors would stay home, children would be sent abroad, investment flows would cease. Iran would not have to shoot at Israel. It would just have to talk loosely about shooting at Israel to do vast harm.
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Iron Dome represents a triumph of Israeli science, generously supported by U.S. aid under both Presidents Bush and Obama. But we remain far away from a high-tech shield against the Iranian threat.
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This week's congratulations to Israel must be tempered by awareness: The biggest danger -- Iran's potential ability to build a weapon that could kill hundreds of thousands in a single strike -- looms as menacing as ever.
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