Quite a few of the protesters are paid, and they are coached to create news-worthy moments of hysteria, in the hopes that the public will be shocked and/or moved to sympathy for whatever cause (paid for by billionaires).
The goal is to affect the voters and make them write to their Congresspeople.
Through the violence of the emotion people see on the news, the publics' brains are supposed to be unhinged and they are supposed to join in, and we see that the result is usually ineffective with those who are actually using logic and their own intelligence instead of emotion to form their personal politics.
Only those who already agree will be affected deeply by these protests, and the rest of us will sit here wondering how MUCH the protesters are earning to humiliate themselves on television.