Laws are just a consequence of an actual cultural change, and can only succeed (and not precede) the conversion of hearts and minds. Voting and democracy should not become a device to placate the dissatisfied masses into silence, make them lineup for ballot, to choose a lesser evil who, in most likelihood, will turn out to be a egotistical power-seeker. We shouldn't conflate voting with "will of the people."
Sadly, no they didn't.
It took until the pictures of uninvolved white women bleeding from rubber bullets for a whole lot of people to say "Holy shit. That could happen to ME!"
In addition, you had videos of cops with their badge numbers covered and press getting arrested.
These protests threw the fact that the police do this all the time and expect to get away with it into the faces of people who don't normally see it.
It also showed that certain police departments can handle this and really do function better thus undermining the arguments of police departments who refuse to change.