There is another problem.Israel is a nuclear power,u don't want to put it into a desperate situation.Especially with its last resort 'the samson option' named after the biblical figure samson who brought down the whole temple on his heads killing himself and his phillistine captors.Basically if faced with extinction,israel will take evrybody from europe to the whole middle east down with it.Some say This was used as blackmail in 1973 to force usa to airlift supplies during the early phase.
Samson Option - Wikipedia, the free encyclopedia
Jews are pretty crazy, moreso than Arabs. They really know how to survive, and have thrived under harsh circumstances. This is likely no bluff.