Israel is a tiny country about the size of New Jersey surrounded by the Mediterranean sea in the west and hostile Arab states on the north, east and south. Israel's 7 million population is made up of about 5 million Jews. The rest are Arabs, Christians, Armenians and others. But Israel's hostile neighbors that make up the Arab league are over 100 million in population, many of them like Saudi Arabia, Libya are oil rich countries. Lebanon, Syria and many other Arab nations still do not recognize Israel to this day. Hamas, Hezbollah and Iran are not shy in declaring that they would like to destroy Israel or wipe it out of the map. This is why Israel needs to pursue a deterrent and therefore ambiguous policy when it comes to nuclear arms. It is only to send the message to its hostile neighbors that if Israel comes to the point of wiped out it will not go without sinking its attacker with her. Otherwise Israel will not (and practically can not) use them.
Taliban attack police HQ in Kunduz (AP)