Yes in some places there are conservatives due to the way that colonialism and imperialism has impacted the world but as far as Iran goes, your quote shows that the people of Iran were sufficiently progressive to reject an attempt by some conservatives to push a conservative agenda. They were defeated in this attempt by the masses who are still overwhelmingly Muslim, but understand that the Quran says hijab is voluntary because it explicitly states religion cannot be compulsory.

No one here has defended it being compulsory, Muslims by and large are not pushing for it to be compulsory, and those that do are embodying a reactionary mindset imposed on them via colonialism and imperialism. Instead of focusing on what Muslims do and don’t do it would be better to focus on ending capitalism so that people everywhere have more freedom from oppressive power structures, access to education and the ability to make decisions from a place of clarity and stability