I think she is doing this for her supporters, to show that she cares about the issues that they are upset with. That said, you're right it's not going to persuade anyone who doesn't already agree with her. I think it looks bad for her too. Remaining calm and refraining from hyperbole would have been more persuasive.
Small, loud, self absorbed band of political kindergartners... let's just focus on the one person here and not just lump everyone in as bad. I share a lot of her same anger and opinions so I take offense at lumping everyone in with her, it sounds like you're kind of demonizing her.