Ghettoization of Baghdad

ABC News is reporting that the US Army is putting up concrete walls in Baghdad, separating Sunni and Shiite neighborhoods. What the hell kind of solution is that? People aren't getting along, so we'll put a wall between them - "good fences make good neighbors?" So now we can separate all neighborhoods into only Sunni or only Shiite, so that if anyone of the other religious sect goes into the wrong neighborhood they can get beat up. So that if anyone of the other religious sect wants to bomb someone, they know this neighborhood is all one sect. Yee-haw! Why bother trying to get people to live together and cooperate, when we can divide them along sectarian lines.