So, you assume we all die together if everything goes to shit? Then why any arab country that hates us didn't try it already in the 75 years Israel has existed? They would LOVE to get rid of a huge chunk of self-determining Jews. Many other non-Zionist Jews feel quite comfortable living among other nations and hiding their Jewishness in favor of the culture they're in right now.

Besides, the international laws of war don't allow for the killing of non-combatant citizens. If Israel is defeated and ceases to exist, a truly sovereign country and not a terror organization that will annex the region can't just pull the trigger and kill all Jews in here.