Iran has zero leverage. Any leverage given is an olive branch. Obama era diplomacy was the right path, Trump is a moron. But the bigger issue here is Iran's free-will pursuit of nuclear weapons. It is a choice they're making. They choose to pursue nuclear weapons, forcing the US to either take a diplomatic path to stop them, or intervene.
They don't have to build nuclear weapons! They're just doing that shit.
Well now they have to, given that a single nuke ownership (and its never a single one, is it) would prevent any such actions. I don't think anybody sane at this point thinks any sort of regime change is going to happen in this century.
The bigger problem is - current war won't prevent them from obtaining it. It may delay the date, but also will make them work smarter, hide things better and give them much more resolve. I can see ie putin helping them get through some technological or material hurdles, that would help him greatly in their war in ukraine.
We can agree that starting a war with Iran is sort of the magnum opus of the worst administration in American history.
But I do feel obligated to interrogate the idea that the US is responsible for this escalation. Iran is seeking to expand its power and influence in the region, and employs violent means upon people - even its own people - to achieve these goals. The regime is, fundamentally, amoral.
The US gets to decide if it wants to put a stop to that. But left alone, the world gets more dangerous the stronger the Iranian regime becomes. The same cannot be said about the United States. The period of history belonging to the unipolar US liberal order was probably the most prosperous and peaceful time in history.
Unipolar being the key here. The world will get more dangerous with a stronger US in the current multipolar world.