The iranian diaspora population in the West do not represent general iranian sentiment
And even if they do represent overall Iranian feelings, they have soured on this war because one perfect idiot and another criminal desperately avoiding jail time have botched everything.
I befriended a guy at my gym late last year (gym buddy, not buddy buddy). It was only during the run up to the war in February that I learned he was from Iran. In the last few weeks, he's been thankful that his family is safe but spoke of several explosions. Even if people hated the regime enough to leave, they likely still have family back in Iran. Who in their right mind thinks a dissident diaspora will embrace talk of erasing a civilization like the fucking moron elected by even more morons just did?
The only thing that has been accomplished, besides killing people, is leaving Iran with an arguably stronger hand than they had before the war AND guaranteeing Iran is for sure gonna try to make nuclear weapons now. That's not a good thing, but Iran didn't fire the first shot despite nonsensical claims of right wing news junkies claiming Iran has been at war with the US for decades.
All the typical excuse makers for stupidity still haven't explained why the war needed to happen when their idiot and his drunk lackey kept insisting less than a year ago that Iran's nuclear weapon-making efforts were "totally obliterated."