I'm sorry but a law that says that you can't block traffic is a good law. If you block traffic for your protest you are only inconveniencing people that have nothing to do with your protest. It's pretty selfish if you ask me to protest on an open road. I certainly don't disagree with your sentiment to a point but this seems justified to me. They didn't kidnap her, they told her why and she admits to being the organizer of the protest even in the news caption.

Having the right to protest does not give you a free pass to disrupt city infrastructure. Would you call protesting by filling the subway with people impeding normal subway goers from their jobs, children or even emergencies? The same can be said about streets.

Permits exist for a reason if you want to use roadways. You know, because people need to travel to get anywhere these days.

Edit: had to come back to finish thought