Operating off the premise that this behavior is unacceptable, how do you propose resolving the problem?
It doesn't seem to me that ignoring and disregarding people's feelings is a good approach. It is a good way to get people more upset and add fuel to the fire. In many cases, unlawful behavior is the result of people feeling shut out, ignored, disregarded, not listened to. When people get told "I don't care how you feel" it is basically the same as saying "I don't care about you" and "you aren't important." What other avenue is there to get others to pay attention to you than throw a temper tantrum? It's an act of desperation, isn't it? So how do you engage people and listen to them before it gets to that point? How do you temper that desperation? It is also good to look deeper, beyond the person, and to the big picture. What factors in our culture and environment drove this behavior? What might we do about those things?
There needs to be, on the whole, a lot more listening. Unfortunately, in spite of listening being a skill, it isn't generally taught as part of our education. Makes things harder, as we end up getting judgmental instead of listening to people. So many conflicts and things could be avoided with more listening and leaving our egos at the door. And yes, all of this applies as much to the people who are protesting as the people whining about the protesters!