Earlier quoted context omitted.
One big thing your missing is that there simply is no way imaginable that a regime change can happen without the US, it's simply impossible at this stage. I can certainly understand why many if not most Iranians want the US to intervene, it's simply the only way regime change is ever going to happen.w
I have lived through regime change in Eastern Europe in 1989. A year before the change, one cannot imagine the regime change. And yet, it did happen. Bloodlessly (except Romania). Any external meddling would have probably made it much bloodier. You can be assured most Iranians do NOT want US to intervene. How many Americans want China/Russia to intervene to 'help' you get rid of Trump? Get off your high horse and use…
Also you seem to not grasp that the current regime are viewed as invaders forcing Islamic rule which I'm pretty sure is very very different from the scenarios your mentioning. And even in your scenario, if Trump really succeeds in destroying American democracy and takes everyone's guns away and closes the internet to the world and starts killing every and all opposition and terrorizes America for 40 years I'm pretty sure you'd like who ever the duck is capable of removing that to intervene. And it's not like I'm making it up, i happen to have many Iranians in my family, and many of them living in Iran still and i can assure you that the vast majority in the big cities want the US to kill off the regime. I'm sure there's some kind of rural population that loves sharia like the us has maga, but i don't think they are the majority any more.