That's precisely the point. Police brutality spans the most prevalent racial groups in the United States (Black, White, and Latino). The problem is not one of particular "Social Justice", but of government growth and social atomization.
If families and, subsequently, communities deteriorate, order will be outsourced to police. A police who are, often by necessity, not from the communities they police, employing military-grade equipment. The more the police militarize, the more people, right and left, black and white, will see it as a kind of military occupation, interpreted through their respective ideological lenses.
America has to situate herself again towards God. Only He can turn vandals into the noble Israelites who, with Nehemiah, rebuilt their wall, redressed injustice, and repented of their sins.