An anecdote:
After Hurricane Ike devastated Galveston, TX in 2008 (among other cities), there was a big push to NOT REBUILD the projects - the Federal government eventually became involved and came down hard against it and block this good idea to have displaced families live all around the city, closer to transportation and jobs and not all bunched together in a project. Democrats must keep as many dependent people and isolated.
It is government’s job to concentrate and cloister as many people it can in efficiently controllable geographical areas. This serves the purpose of economies of scale and efficiency as well as being a powerful influence in the process of shaping the public’s thought process.