On the contrary, Iran has threatened the existence of Israel. Israel now has the sovereign right to strike Iran at any time. They may be well aware that the IDF would destroy them, but unlike the soviets during the cold war. They have a jihadist ideology and are willing to die and sacrifice their own innocent people. That is why Israel must strike first. Unless of course Iran gives up on its Nuclear program. But no one thinks that is going to happen any time soon.
10 arrested at Israeli Arab protest in Ramle (Haaretz)
from the article: Netanyahu: Iran preparing for another Holocaust