I suspect that in many details, our visions will not tally–and I suspect there are even bigger structural and attitudinal barriers than Williamson here accounts for–but I quite agree that people who provide goods and services and people who need them have to be allowed to get together and make neighborhoods that really work.  

Trying to keep everyone on a government dole and leash is going to produce precisely the results it always has.  Bad ones.

Quoth M. Williamson:

There are two straightforward ways to improve the material conditions of people living in the poor parts of Baltimore: Move them out or move capital in. There is a little something to be said for moving people out of dysfunctional communities; I have in the past argued for a kind of reverse incarceration for young men convicted of serious crimes in gang cases — i.e., that during probation or parole they could live anywhere in the country they liked, so long as it was more than 200 miles from their home town. But that’s a narrow question. The real issue is moving people, businesses, and resources into poor neighborhoods — which is not going to happen when the locals are assaulting people, burning down businesses, and destroying resources. Lawlessness and violence convert assets into liabilities — all those boarded-up houses that once were homes are attractive nuisances on a massive scale. Somebody, somewhere, wants to sell things in those abandoned Baltimore storefronts, but no one can, because it is not safe.

(source: One Weird Trick That Can Help Make Your City More Prosperous)