Usually, when a foreign power tries to "liberate" another country, they don't go and bomb civilian installations indiscriminately on the literal first day of conflict. Also, dealing with your own government is one thing: dealing with a foreign government who's much bigger and stronger as a regular civilian is pretty much impossible. Iranians do not like their government, but they don't want someone else to change it - they want to do it themselves, and you can't really do that if a foreign government is bombing you to smithereens as much as they're bombing your government.