than the police

The people who do this, who judge the victims much harsher than the perpetrators (police) will ultimately be responsible for all the violence that may be inevitable

...and did it start with Michael Brown, or with Trayvon Martin?

Police have more body cams, and people are getting more willing to whip out their phones and record during policing situations.

There are no national statistics reporting on police violence. We don't know at what rate our police forces are murdering us, beating us, maiming us. We don't know if the rates are increasing or decreasing. Media attention has increased mostly because, as far as I can tell, the proliferation of video devices has made evidence of astounding brutality irrefutable.