Egypt, Syria, Iraq, Libya they all had chemical weapons which are a poor mans nuke and they have all used them either against civilians or foreign armies so Israel needed nukes. Egypt that likes to try take a moral high ground call for an atomic free region but they still have chemical weapons and refuse to sign the Chemical Weapons Convention. Egypt gave chemical weapons to Syria on the eve of the Yom Kippur War so they were obviously willing to consider the use of chemical weapons against Israel. They helped Saddam Hussain with his chemical weapons program right up until the early 90s so Egypt are the worst offenders of all when it comes to the spread of WMDS in the region. Iran is currently developing nukes. Israel has said that when it has full peace with every country in the region palestinians and Iran included then it will support a WMD free Middle East but not until them.
Turkish ruling party preparing to replace PM Davutoglu, say officials (Reuters)
from the article: UN nuclear assembly rejects Arab resolution to single out Israel