We have freedom of speech. Anybody should be able to display whatever flag they feel like flying. Saying that it is OK for some protest group to fly their flag isn't saying you approve of the ideas that group has.
The whole problem with the leftist culture of censorship is that it seeks to remove the right to free speech.
People should be free to express themselves as they see fit, whether it is displaying a flag associated with history, or a regional culture, or one associated with a political movement.
Good point and I thank you for that