Good keep doubting this and do not attempt to bomb the missiles. Assad will thus not retaliate and everybody on both sides will be happier. You can also doubt (and maybe it might be true) that Iran has nuclear weapon, and thus refrain from bombing Iran and accordingly Iran will not bomb Israel back and every one will be at peace. Similarly if you can convince the Palestinians that they are not occupied by giving them equal rights and treating them fairly, maybe they will start doubting they are under occupation and you two can live together in peace.
U.S. defense chief tells Congress: Military options remain against Iran (DPA)
from the article: Israel doubts Assad possesses S-300 system, but has good reason to worry