Those who argue for a preemptive strike against Iran cannot explain exactly how American planes and missiles would take out all the subterranean nuclear facilities without missing a stashed nuke or two -- or whether they might as well expand their target lists to Iranian military assets in general. None can predict the fallout on world oil prices, global terrorism and the politically fragile Persian Gulf, other than that it would be uniformly bad.
In contrast, those who favor containment of a nuclear Iran do not quite know how the theocracy could be deterred -- or how either Israel or the regional Sunni Arab regimes will react to such a powerful and unpredictable neighbor.
The present crisis with North Korea offers us a glimpse of what, and what not, to expect should Iran get the bomb. Mahmoud Ahmadinejad would gain the attention currently being paid to Kim Jong-un -- similarly not otherwise earned by his nation's economy or cultural influence.
We should assume that the Iranian theocracy, like the seven-decade-long Kim dynasty in North Korea, would periodically sound lunatic: threatening its neighbors and promising a firestorm in the region -- if not eventually in the United States and Europe as well.
An oil-rich, conventionally armed Iran has already used that playbook. When it becomes nuclear, those previously stale warnings of ending Israel or attacking U.S. facilities in the Persian Gulf will not be entirely laughed off, just as Kim Jong-un's insane diatribes are not so easily dismissed.
North Korea has taught the world that feigned madness in nuclear poker earns either foreign aid or worldwide attention -- given that even a 99 percent surety of a bluff can still scare Western publics. North Korea is the proverbial nutty failed neighbor who constantly picks on the successful suburbanites next door, on the premise that the neighbors will heed his wild nonsensical threats because he has nothing and they have everything to lose.
Iran could copy Kim's model endlessly -- one week threatening to wipe Israel off the face of the map, the next backing down and complaining that problems in translation distorted the actual, less bellicose communiqué . The point would not necessarily be to actually nuke Israel (which would translate into the end of Persian culture for a century), but to create such an atmosphere of worry and gloom over the Jewish state as to weaken the economy, encourage emigration and erode its geostrategic reputation.
North Korea is a past master of such nuclear shakedown tactics. At times Pyongyang has reduced two Asian powerhouses -- Japan and South Korea -- to near paralysis. Can the nations that gave the world Toyota and Samsung really count on the American defense umbrella? Should they go nuclear themselves? Can North Korean leadership be continually bought off with foreign aid, or is it really as crazy serious as it sounds?
Iran would also be different from other nuclear rogue states. The West often fears a nuclear Pakistan, given that a large part of its tribal lands is ungovernable and overrun with Islamic radicals. Its government is friendly to the West only to the degree that American aid continues.
Yet far larger and more powerful India deters nuclear Pakistan. For all the wild talk from both the Pakistani government and tribal terrorists, there is general fear in Pakistan that India has superior conventional and nuclear forces. India is also unpredictable and not the sort of nation that can be periodically threatened and shaken down for concessions.
Iran has no comparable existential enemy of a billion people -- only a tiny Israel of some 7 million. The result is that there is no commensurate regional deterrent.
Nor does Iran have a tough master like nuclear China. Even Beijing finally pulls on the leash when its unpredictable North Korean client has threatened to bully neighbors and create too unprofitable a fuss.
Of course, China enjoys the angst that its subordinate causes its rivals. It also sees North Korea as a valuable impediment to a huge, unified new Westernized Korea on its borders. But that said, China does not want a nuclear war in its backyard. That fact ultimately means North Korea is muzzled once its barking becomes too obnoxious.
A nuclear Iran would neither worry about a billion-person, nuclear existential enemy nearby like India, nor a billion-person patron like China that would establish redlines to its periodic madness. Instead, Teheran would be free to do and say what it pleased. And its nuclear status would become a force multiplier to its enormous oil wealth and self-acclaimed world leadership of Shiite Muslims.
If North Korea has been a danger, then a bigger, richer and undeterred nuclear Iran would be a nightmare.
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