the iron dome does not fire an interceptor if the trajectory of the incoming missile is calculated to land in an unpopulated. 12% of the missiles fired from gaza should have been shot down but weren't, whereas 88% were. the other hundreds of missiles landed in open fields or places where people don't congregate.
Jerusalem suburb of Even Sapir evacuated as wildfire spreads (Haaretz)
from the article: The porous shield of Israel's Iron Dome