It's pretty clear he's trying to appeal to a white liberal audience that recognizes that racism exists, but is quicker to blame the victims than the structures and the culture that keep it in place. Racism is part of the fabric of american society and culture. The country was founded by and for haters. White men with money who hated monarchy got together to develop a country that would allow them to prosper and only begrudgingly extended some of their privileges to other people. If you're surprised by racism in 2014, you've lost.
It doesn't take a sociologist to understand that America is a country designed for a specific type of person. Of course a white officer that uses excessive force would get away with it given the context that he is situated in. It doesn't matter what the person did, he was unarmed. It is for this reason that officers have stun guns, pepper spray, and other non-lethal options and why they patrol in duos or teams. But America's fear since the beginning was a strong non-european male. Whether he's intellectually strong, physically strong, or spiritually strong, it doesn't matter. Of course he's going to be rewarded for removing a percieved threat. Black people aren't seen as human beings in America and the sooner more black people realize this and do as other people(such as affluent white people) do, and seclude themselves in sustainable communities or move to other countries the better.