You'll be surprised to learn that the way free speech exists in the US doesn't really exist in most other countries. In many western countries, hate speech, racism and nazism are prohibited speeches.
Trading with Iran is one example of that. You can be effectively shut out from the financial system of the world if you decide to ignore US sanctions, even when you don’t have entities, customers, suppliers, or employees in the US. Cuba and Panama’s existence are other examples of when countries ignored the US and paid the price.
I don’t think the US is particularly evil or anything like that, but true free speech is a whole lot easier to safeguard when you’re not relying on the patronage of a superpower. And today, most countries either are a superpower in their own might or rely on one for participation in the global economy and modern world.
…and there’s some cruel irony in suggesting the dismantling of a culture to leave room for free speech. I believe any sort of sustainable freedom of speech will have to grow organically into the culture. And that unfortunately takes time.