In general, white person fails, they blame it on themselves, the other person, the situation, the past that brought them to that failure. Sometimes they try hard to rise above this, other whites are lazy and fail and are content with not reaching their goal and they become worthless.
For black person it is the same situation they can blame the same things but they also have the white man keeping me down and race card to play so it just creates another thing to blame for why they didn't reach their goals.
This small % difference creates a "more content with failure" attitude.