Economic sanctions prevent these regimes from entrenching themselves and growing. And if it didn't, the Iranian regime wouldn't be seizing ships and harassing our Navy to protest the sanctions. They work. And bad govts have crumbled using this and supportive efforts. Are you sympathetic to the underclass dissidents getting tortured and killed or the small fraction of Iranian upper-middle class elites complaining about the USA sanctions and not fully condemning the murderous Ayatollah?
I replied to this in a reply to someone else up above. You may have the the last word. And I do hope a peaceful solution is found. I especially like every Iranian expat I every met. I want to see every sanctioned nation prosperous and with a vibrant democracy. Have a good weekend.