If any head of state had threatened to "shower Washington DC with rockets", that mere threat, even if clearly empty, would have been more than enough for the U.S Military to launch a devastating strike on his capital. Just think about it, if Hugo Chavez had said that on TV, the B2's would be on their way right now !!! ... but Israel won't do anything. For better or worse we do indeed show much restraint !
Clashes between IDF and protesters in Bethlehem and East Jerusalem (Reuters)