Iran is a signatory of the NPT, Israel is not. Israel has threatened to attack Iran multiple times and has attacked other countries in the Middle East multiple times; Iran hasn't attacked anyone. Israel introduced WMD into the Middle East, Iran did not. Israel is of course totally against Iran ever acquiring the deterrent value of WMDs, but for the rest of the world, Iranian capability in that area might very well work to preserve peace, just as it did between the West and Russia during the cold war.
Palestinians report IDF airstrikes on Islamic Jihad targets in southern Gaza Strip (Haaretz)