OK, but this was more like Serbia/Kosovo/Bosnia.
Maybe GP was asking about previous Yugoslavia war, where AFAIR there was no intervention and massacres continued for quite long.
I doubt there will be a ground invasion this time. The current US administration cannot build a coalition (and logistics without a coalition is hard), not will the US public go for it.
And is there really much you can do from the air that wasn't done already?
Either the Iranians do it themselves or it doesn't happen. Sadly, I don't see any good outcomes for the protestors. But you never know, oppressive regimes appear stable, until they are not.
I don't recall that being any part of the rationale for the US war in Iraq (which, to be clear, will hopefully go down as the least just war the US ever instigated). "We'll be greeted as liberators" was trotted out as a mitigation for how bad occupations normally are, but we were going whether or not that was true. The Iraq war was not a war of liberation against an unjust government. It was a war of choice against a country that happened to have a horrendously unjust government.
The pretext for the Iraq war was that they were involved in 9/11 and possessed weapons of mass destruction.