Chicago, America's most segregated big city

The Chicago Tribune reports:

Blacks make up about 35 percent of Chicago's population of nearly 3 million and are largely concentrated on the South and West Sides. Whites make up nearly 28 percent, largely located to the north and in slivers of the South Side, while Hispanics, about 30 percent of the population, are scattered to the Northwest and Southwest Sides of the city center.

Why don't urban liberals in the big,Blue City want to experience "diversity"? No word yet from the urban lovers, on why Chicago is only 28% white: when we keep hearing stories about whites moving back to the Chicago.Also,no word yet from Rahm Emanuel or Barack Obama on sending their kids to public schools to "experience" diversity.