Sure there are bad cops of all races. 2 or 3 of the 6 cops involved in the Freddie Gray lynching were black. It was a black cop that shot the white lady in Minneapolis. However, most of these cases where unarmed blacks are killed, evidence are planted in cars, confessions beat out of people in custody involve white cops. I'm sure you can google this and google that to find exceptions. However, I challenge you and others to think from the top of your head that since you were a kid until now, have you ever heard of a white person in custody having a confession beat out of them for a crime they did not commit? Or heard of police planting evidence in a white person's vehicle.
Poor whites have as much privilege as wealthy white people. The white woman in Ohio that received a lesser sentence than the black woman for a similar crime by the same judge was not wealthy.