My point is that an outside force coming in will help the current regime and/or the ideas behind it. Even if the current regime falls, democratic or pro-Western ideas in Iran will be seen as aligned with the invading force and rejected by many people who might otherwise be open to them.
Is there anyone who likes being invaded by a foreign power, ever?
If president Trump doesn't declare martial law, start a civil war, military coup or change the constitution of the USA, he will stop ruling in 3 years. We can wait that long.
Do you think the people fighting ICE in the streets of Minneapolis would welcome a joint Chinese+North Korean decapitation strike on Washington and cruise missiles flying over Portland?