A few questions and comments about this... trying to be objective here. We don't know all of the details.
6. We should view this as cop shoots and kills unarmed, non-violent man, not white cop shoots and kills unarmed, non-violent black man.
Did you see the video from a couple of months ago where a white cop in south carolina pulled over a black guy and asked him to get his drivers license, and when the black guy reached in his car for his wallet, the police officer, clearly terrified, shoots the guy a number of times?
1. I don't necessarly think that the white cop is "racist." I don't know anything about him, but I have no evidence that he is.
2. That being said, there is no doubt in my mind that if it was a white guy, dressed the exact same way, that he pulls over, and the white guy behaves the exact same way, the police officer doesn't get frightened and shoot.
I can't say what the "root" of the issue is, but I believe it to my core. And that's why it matters what the races are here.