The suggestion that Israel would be passive during an Iranian attack is an absurdity. Teharan would be leveled within 24 hours. And Iron Dome is only one level of Israel's missile defence shield. And what evidence do you have that Iran's missles are accurate over a long range? I'd be quite worried in Syria, Jordan and Saudi Arabia of them landing there instead.
ISIS group seizes villages north of Aleppo city (AP)
from the article: The porous shield of Israel's Iron Dome