So racists aren't born, they are made.
Now, the killer cited the crime stats before shooting. It seems that was a primary motive. So if blacks weren't killing and raping whites in such numbers, it is reasonable to say this killer would not have shot up the people in the church.
Now this is not approval of his actions, or justification for killing people, but to better understand what creates racists. Every new knockout game played, every new white murdered where the race of the perp is deliberately hidden but still found to be black, these create new racists everyday. Just like the shooting of the church and it's people have created more racists.
Neither side is innocent, but to just blame it on racism ia short sighted and helps nothing.