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If you're worried about a state that terrorises the region, best to focus on Israel
Or the Wahabi regime that sponsored the sort of fanaticism that led to the rise of Al Qaeda?
Let's not put a moral spin on America's realpolitik.
The other unknown is how far the U.S., Isreal, and potentially other countries are willing to go. Turning the lights off and literally sending Iran back to the stone age wouldn't be so difficult at this stage, but would probably rule out the possibility of a deal that sees Iran disarm and hand over the enriched uranium.
Iran had already offered to give up the enriched uranium bit that is off the table now. Iran should and will pursue a nuclear weapon in order to protect themselves from American and Israeli imperialism.
Even Netenyahu has said you can't do regime change without some sort of boots on the ground. Iran is much bigger and more mountainous than Iraq. The IRGC has a couple hundred thousand active personell.