God has not allowed the complete destruction of the Jewish people.
God has allowed the political, earthly, state of Israel to be destroyed multiple times.
God has also allowed the destruction of millions of Jews within the last century.
Do not presume that you know what God will or will not do.
As Christ said, His Kingdom is not of the Earth. If the earthly, political State of Israel wants to survive on the Earth, it needs to depend on earthly forces such as the IDF and not in a belief that, no matter what, God will protect it because they know what God will do.
“depend on earthly forces such as the IDF and not in a belief that, no matter what, God will protect it because they know what God will do.”
These are not IMHO mutually exclusive. But beside that, God HAS SAID what He will do. God has told us how this ends (who wins). We choose our side and we do our labor.
God told Jean D’Arc: “YOU fight the battle, I will give you the victory .” The forces on earth and the forces of Heaven will meet somewhere, probably soon.