“If the regime would be interested first and only in nuking Israel, they would have quietly finished their bomb and launched them without fanfare.”
Iran tried to finish the bomb quietly. It was exposed by a group of Iranian exiles. Iranian government tried to keep it secret at all cost.
Once they have the bomb and related material, they can hand out the technology to Hezbollah, Hamas or any other Friends-of-Obamambi groups.
You may be able to sleep well with Iranian bomb, but I doubt Israel can trust that Iranian are not using it. They ignored Hitler’s rants about destroying jews in Europe and it did not play out too well. Now they have learned their lesson.
But I gave my assertion that Iran will not first strike. They gain WAY more by the threat alone. (They want to gain great power status, not "martyrdom". The leaders that is... the peons are not their concern.)
Iran tried to finish the bomb quietly. It was exposed by a group of Iranian exiles. Iranian government tried to keep it secret at all cost.
Even if so they would try to placate the fears by insisting that it's peaceful and leave out the rhetoric and bluster.
They would finish the project and launch it. The propagandstic bragging would then come after the established fact.
A dog that barks doesn't bite.