Isreal is using deplomacy in this Iran attack on their respond in order ni to excalate the issue beyond what they can handle as they are not yet settled with ongoing Gaza war, engaging with Iran will course a cheap prey over the hand of their attackers. Isreal would have responded in bigger way that would have course greater damage against Iran but hard it been they do by now Iran will have engage with them in full scale war.
One thing we should note among all this attack some nation who may act as showdown members to bring third world war into reality is their waiting for who will leads in this case to enable them showcase their interest openly, but them applying deplomacy may subsided any excalation though respond may not equate to what Iran did but they still show that dey are not that weak stand to reply their declared words .
There will be no Third World War because of Iran. Iran does not have strong allies, and in Iran itself there are many people who hate the ayatollah regime.