I'm torn. On one hand, the protesters, as long as they are being reasonable, have a right to peaceful assembly. On the other hand, I fear this is going to quickly become a "FUCK THE POLICE! FUCK THE LAWS!" kind of protest from some people, which always provides a nice back door for anarchists and people who want to cause trouble to sneak in and do just that.
We should be upset, we should be trying to affect change and we should not stand for excessive force on either side. Neither side wins if they don't at least respect the other and I'm already clearly starting to see cases of respect disintegrating. Being an "outlaw"/ breaking the rules, rather than trying to fix them, has long been a part of American culture.