Hama rocket costs $250. Intercept missile costs $100,000. So if Hamas fire 3,000 rockets at a cost of $750,000 it will cost Israel $3 Billion to shoot them all down. That would use up all the aid America gives you. Who would pay for Hama's rockets? I think Tehran would pick up that tab quite happily.
Red Cross delivers aid to Taiz, Yemen, for first time since August (Reuters)
from the article: Iron Dome system deployed in south, but might not stay