Everywhere that had a significant black population ended up disenfranchising them through various means as a system of control. The result is a subculture with disparate social, moral, and economic ideals from the "mainstream". These are the same places where people wonder "What is wrong with black people?". Look at the similar situation in places like South Africa.
The problem could have been solved nearly 150 years ago. Following the Civil War freed slaves went to school, voted and got elected into office. By any tangible measure they would be almost as well off educationally, economically and socially as whites within a generation. Instead their civil rights got traded away in a quid pro quo to create the "New South". Which lead to another 100 fucked up years (Jim Crow was some pretty special treatment) and another 50 years of people saying "Why won't they just get over it?" as if two generations if some incredible length of time for cultural and social norms to shift and a middle class to emerge.
No one has said that creating entertainment for an exclusively white audience is racist. You just declared it to be so and used my doubts about it's fiscal viability as "proof" of your position.