I'm assuming if Israel is wiped out so will most of the arab countries.
In the mid-70s, I read a piece (possibly in Rolling Stone) about Israel's nuclear program history. There was a anecdote (source unknown) about the 1973 war. Moshe Dayan went to Golda Meir and said, "the Third Temple is ending," and she then authorized the use of nuclear weapons as the final retribution. The bombs were being loaded onto the planes when the arrival of the reservists, and then the US airlift, and the Sinai counterattack, turned the war in Israel's favor.