A pleasant article and in fact our family lives in an urban setting where all neighbors on our block, and beyond, are quite connected. We have each others house keys for emergencies.
A dangerous presumption, however, is that group-think is always a positive maneuver.
Group-think was certainly positive in the 80's and for some unfortunate reasons, e.g., economy of work place design, controlling employee costs, etc...
Modern studies show time and time again that individual effort, in private, leads to innovation and extraordinary accomplishment. Many argue that group think is a disaster.
A few links for everyone's convenience.