If you'd read my comment you should've been able to understand that I'm talking about a subset of the protestors - not the person this case is about. Like it or not, if you're part of a group which doesn't actively expell such participants, you end up destroying your own image. And people related to that group usually get judged by the actions of the worst of it's members.
Hence why it'd be impossible to convince anyone with an example like this article.
To be abundantly clear: I never meant to imply that this isn't a problematic case (nor did I write that). I'm merely pointing out that nobody will be convinced of the grandparents call to action with this example