[littledude]

I think this tends to happen once density of the place people live goes above a certain threshold. People don't have to rely on their neighbours because they know so many people (friends/family/coworkers) close by they can contact if they need help with anything.

On the flip side your neigbours are most likely potential see you arguing with a partner, coming home drunk late at night, going out after calling in sick etc. See things that tarnish your reputation, more downside than upside if you find out you have connections and potential gossip.