If you want to behold the perfect case study in how the racist-white-cops-are-brutalizing-innocent-black-people narrative came to be, you can't do any better than the incident that occurred recently in Las Vegas involving Seattle Seahawks defensive end Michael Bennett.
Bennett was briefly detained after he got caught up in a police investigation of a reported shooting, and proceeded to publicly denounce the cops, accusing them of having handcuffed and detained him for no reason other than his "being a black man." He also claimed that once officer stuck a gun to his head and threatened to kill him.