The key component is the press. Without it, passive resistance is ineffective. And it is a double edged sword. A video or pictures can show a person being unfairly abused, or the protesters abusing someone else.
Vietnam is a perfect example (the 60s). At the time the press was pretty limited to newspapers. Now, everyone has a camera on their phones and we have the Internet. And almost instantaneous news. I think that this helps.
I'd like to think that showing the rioting and looting will give the peaceful protesters pause. To any reasonable thinking person, it doesn't look good. I think that they are embarrassed by it and realize that it doesn't help their cause. But the violence must be shown as a way to stop it.
Very thoughtful.