The other hypothesis is retaliation... which obviously turns to a global war. I don't know if precisely a WWIII because the domestic situation of well developed countries is lazy regarding military action.
[1] "Fending Off Iran Attack Is a Major Israeli Achievement. Retaliation Would Risk an All-out Regional War" https://www.haaretz.com/israel-news/2024-04-14/ty-article/.p...
with regards to "domestic calls", you should go and read some data on support levels of iranian government, etc.
To my eyes, compared to what Israel is actively doing against Palestinians, this really doesn’t seem that bad. In fact I would even go so far as to say it is expected. Countries engaging in genocide rarely do so in peace.
Now we have a very substantial provocation by a party working on nuclear weapons. After they can threaten Armageddon they can export nearly unlimited harm short of existential.
We'll be hearing a justification for a preemptive strike on their ability to make war shortly and in 90 days half their leadership will be dead.