Needs to be better worded:
Will Israel do what is necessary when Iran does the expected?
I try to think of a simpler analogy. Compare Iran to a neighborhood berserker, who routinely beats his wife badly for wearing “immoderate” clothes, has killed one of his own children for being homosexual, and in the past has killed neighbors he got into arguments with (the Iran-Iraq war.)
This guy is now standing on your property line with a gun in his hand. He is shouting that he is going to kill you, your wife, and all your children.
Do you shoot him now, because of his threats, coupled with his violent history, coupled with his having the very visible ability (the gun) to carry out his threats? Or do you wait until he starts killing your family?
Oh, you’ve already called the cops, and they delivered extra ammunition to the ranting neighbor.
Is this a hard question to answer?