With precision guided munition and air superiority there is no need for indiscriminate nuclear bombs.
But Japan does go to show that:
1. Leadership change is not voluntary, even when faced with obvious military dominance.
2. requires horrific destruction
3. Can be good for the long term of the country.
Let’s not forget IRGC has a long list of atrocities and oppression to their name. Yes… yes… you might say the same of USA, but it is categorically different.