Why does Israel have problem with Iran Nukes?

Israel is surrounded by countries that dont like it. Israel is a heavily armed nuclear country, that hasnt declared its nukes, but threatened to use them in Yom Kippur war on the brink of destruction even. Sooner or later one of these arab countries was going to get a nuclear weapon, cant stop them forever. It was expected, Israel is not best friend with those people anyway. So i dont see what the problem is? I think if anything was to be done it would have happened by now.