Let's assume that Israel would attempt a strike on Iran. They would have to fly over Saudi Arabia or Iraq. If these nations did not challenge an Israeli overflight they would be considered equally complicit in an attack on Iran. Considering the Shiite majority in Iraq this would be a major issue and the government would likely fall and, with Iran's help, dissolve into civil war. (If Iraq was overflown) As for the Saudis, yes they don't like Iran, but they don't like Israel even more. The Saudis would die before they would become openly complicit with an Israeli attack on an Islamic state. Such an attack would certainly kill civilians even if it did not accomplish the mission. Having their bluff called (to make an attack) would really put Israel on the spot Such an attack has the potential to cripple the relationship with America and touch off a mideast war. Added to this is the opportunity Iran would have to show us what they can do with their missiles. I think that such an attack could be the beginning of the end for Israel, but I don't think that they would mind gambling with the lives of Americans, Iranians, Saidis, and Iraqis, and, maybe a few Israeli Jews.
Stabbing reported in Kiryat Gat in southern Israel (Haaretz)
from the article: U.S. army chief heads to Israel as fears over attack on Iran mount