Radical liberals, like Obama, believe the problems of our inner cities derives from those who left for suburbia, taking their wealth with them.
If that wealth had stayed within our cities, they would not be in such a state of decay, disrepair and debauchery.
The theory is that liberals like Obama want to punish the suburbs and rural areas and transfer that back to the inner cities, restoring their greatness.
Of course, the problem is that our inner cities are populated by people who have discarded civilized behavior, shunned law and order and are totally dependent on gov't services for their basic needs.
Investing into that will not change the culture. You would open the biggest manufacturing plant, the best restaurants and the workers will come form the suburbs, not from the inner city.