Tell me, who caused the revolution in 1979? And why?
Locals were tired of the shah's authoritarianism, and there was a communist-islamist pseudo alliance waiting at the wing (sounds familiar?). Locals gullibly supported this takeover, especially the rural Iranians who were more religious, mixed with naive commie urbanites who thought their side would prevail, thinking of good old Mosaddegh days.
Once the revolution was done, the islamists ruthlessly decimated their former communist allies and made the country a theocracy, with even worse authoritarianism and abuse than the shah, but without the economic growth.
And characteristic of a theocracy, they put ideology before national interest, primarily by going after the west and Israel, diverting money to proxies, and taking their country on a belligerent path, leading ultimately to the current situation. Overall they completely derailed themselves after the revolution. They would have been a first world country right now has the monarchy remained and they maintained good ties with the west and Israel.
Now you tell me how was Israel threatening Iran in any way that justified their proxy war and obsession with Israel? Who initiated aggression between the two? Why is Iran supporting hesbollah? Why has Iran made its primary foreign policy objective to wipe out Israel?