Truly sad!! And what happens is that at some point, it spirals out of control into a miserable vicious circle.
Once companies leave, most qualified workers leave along with it. Then the perception that white people are mass-exiting the city, creates true max exodus. Very few jobs left = increased crime. Increase crimes rates make the city even less desirable for investors and workers. As people turn to crime to survive and build up criminal records, they become unemployable and further socially excluded.
I don't completely buy the concept that "black areas" are poor because the government doesn't care about these areas. This country despite all the racism that still exists, is still the country in the world that offers the most opportunity if you try hard. But this require effort.
I've seen people imigrating to this country from various places around the world (middle east, africa, asia) with barely nothing and within a few months/years are leading integrated and progressive lives - kids going to school, opening businesses, improving their communities.
Sitting around with your hand out waiting for someone to come give you something accomplishes nothing.