Certainly, Israel has good reason to prepare with bomb shelters and much more, but now with the latest revelation of Syria providing Hamas with longer range (over 400 miles) Skud rockets, they had better get ready to use those shelters.
I can imagine a scenario that might play out something like this: Israel finally tires of waiting for the U.S. and the Obamanation to disuade Iran from their nuclear ambitions and now knowing that Obama has pretty much made it known that we will not have their back, Israel feels they must do it on their own. Iran tells Hamas to use their newly acquired rockets to strike Israel to take Israel's attention off of them (Iran). In desperation, Israel takes out Obama and makes it look like it was the work of al Qaeda. This, in hopes that maybe they can persuade Joe Biden to back them in taking out Iran.
This might sound far fetched and crazy, but think about it; Israel has to be getting a little desperate and time is running out. They have to believe that when Iran does get a nuke, they will have no problem handing it off to Hamas to use on one of their Skuds. Israel can probably go it on their own, but if I were them, I would want some backing. They can't help but feel betrayed by Obama, so there you go.