In fact they really don't want to nuke Israel, they want Israel to attact them and kill a few million Iranians for the big backlash that will come on Israel from the WHOLE world. The dead are Shihadda that died for the cause, thus crying out to the world for Israel to be punished and they will. The number of aircraft that can arrive with a payload is small, it's a long flight, and the actual locations to bomb is not 100% clear. So that leaves nukes that would kill most of the population around the sites, mostly around Teharan. ATTACKING IS A NO WIN OPTION !! But for those of us that believe in the God of Israel, "Israel is safe"
UN to hold off on separate Afghan bombing probe for now (Reuters)
from the article: Cries of 'hold me back' may lead Israel to strike Iran