THE POWER OF FIFTH COLUMNS, OR "WHEN WINE ENTERS, SECRETS EXIT": Hirsch Goodman has a fascinating column about a dinner he had with a Palestinian "peace activist:"

We have known each other for quite a few years and I have always had deep respect for his views, hence the importance I attach to what he said that night, despite the three glasses of wine that went down with his meal.
The Zionist experiment, he told me, is over. The Palestinians have discovered a strategic weapon: suicide bombers. Once anathema, they are now considered heroes. The shahids (martyrs), once seen as religious fanatics, are now nationalist freedom fighters. Moreover, he continued, they are growing in legitimacy all the time. The Arab world understands them and even some Europeans seem to. The Israelis have F-16s, the Palestinians, suicide bombers. The equivalency is obvious to all.
Now, he continued, there are thousands out there waiting in line to kill as many Israelis as they can, to make your lives hell on earth. They belong to no organization, but want revenge and are prepared to die for it. You think you are going to stop them by punishing their parents. You are wrong. You won’t even know who they are or where they came from. Nothing will be left of them.
We are going to hit you everywhere we can: gas stations, theaters, parks, wedding halls. You will know no happiness. It will be one funeral after the next.
And then, while you are reeling, the 1.5 million Palestinian allies, the Israeli Palestinians, our brothers and your enemy, will rise up as well. They are just waiting for a sign from us. They know you better than you know yourselves. They speak your language and know every street in every one of your cities. They are familiar with every nook and every cranny. And they will join at the right time. Make no mistake about it.
And then what does Israel do? Transfer? Can you imagine CNN and the BBC reporting live as the Jews transfer truckload after truckload of Palestinians over the border? Your country will lose all legitimacy. The Arab world will go to war against it. You will be a pariah, worse than South Africa under apartheid. Your generals will be tried for war crimes. The world will impose sanctions. Your F-16s will run dry of fuel.
Your people will leave in droves, especially professionals.
The Zionist experiment is over.

With "peace activists" like these, who needs terrorists?
Buried in this declaration of war is the true lede, the elaboration of Israel's greatest vulnerability: the chance that Arab citizens of Israel will actively join the Palestinians and fight against Israel.
It is apparent that the Palestinians do not control their Israeli cousins in the manner fantasized by Goodman's peace-loving dinner companion. (The same way it is apparent that Al-Qaeda does not yet have nuclear weapons; if they can use this weapon, what are they waiting for?) But if the Arab Israelis ever did start aiding terrorism on a large scale (something which has been fairly rare up to now), engaging in sabotage or otherwise fighting against Israel, that would have the potential for destructive consequences beyond the reach of the current conflict.
In my opinion, Israel would be able to, if the situation deteriorated sufficiently, effect a quasi-"transfer" (especially if it is a matter of moving Palestinians within the West Bank and/or to Gaza) and survive (especially if it is accompanied by the evacuation of isolated, indefensible settlements). But if Israel ever had to send tanks against or attempt to expel up to a fifth of its own citizens, that would be another matter entirely. That scenario is the Palestinians' true nuclear weapon; it is fortunate that they do not appear to possess it.