It's countries filled with uneducated people who don't understand how to evaluate information that are vulnerable to this kind of propaganda. I think a more fundamental long-term solution is to fix the education and critical thinking problem. After you've done that, you can allow free speech, and democracy for that matter. By default, people aren't competent to safely handle free information because they're so easily manipulated into violence.
For example, see every war ever. In any war, both sides believe they're right, but they can't both be right, so one or more is always wrong. They just can't see it because they can't process information safely.
For example, see every war ever. In any war, both sides believe they're right, but they can't both be right, so one or more is always wrong. They just can't see it because they can't process information safely.