He can want to kill a black guy and not get stupid about it by emptying his gun into him. He shot how many times? It only takes one. Had it been a white girl, he wouldn't have panicked at all, probably not even a white guy. Black males get treated the same way as white skinheads or trailer trash. It's always a worst case situation every time for the cop. Unlike the white male, the black male isn't treated much differently regardless of his attire, car or education. He's shot.
Officers know that black men are exponentially more likely to be criminals and hyper aggressive than their white counterparts. They know this because they see the stats. They are told to ignore it, but they cannot and so they shoot.