They destroyed most of Iran's air defences and BM TELs during the 12 day war. Iran simply couldn't replenish its stocks in time and so decision makers decided to finish them off before they could possibly recover.During 12 day war, Israel controlled Iran airspace bombed the hell out of whole country, yet nothing happened to neither nuclear facilities nor Hamanei.
Now, the first very strike with tomahawks targeted Hamanei's house and he is dead.
I have lots of questions.
I guess it's odd that they didn't accomplish this in a single campaign, and waited over half a year to make the next move.