I'm sorry you can't follow the line of thinking. Police didn't just become brutal overnight. It's generations in the making. Starting with social policies that have kept poor people poor and uneducated , especially black poor people. Poor and uneducated people tend to have children out of wedlock at a much higher rate. Children without father figures tend to turn to a life of crime at a much higher rate and also to have a lack of respect for authority figure, aka police. These are all established facts backed up by studies.
Add in the war on drugs and police that are recruited largely from former military and you have a recipe for disaster.
Add in the war on drugs and police that are recruited largely from former military and you have a recipe for disaster.