There is existing data that strongly suggests corroboration here. Isolationist and/or segregated communities breed distrust of those outside the community. Cul de sacs are but a softer implementation of that segregation. Buying trends indicate that in most cases, cul de sac purchases are done with less diversity in mind -- whites buy in predominately white cul de sacs, minorities do the same; which just compounds the self-reinforcing price strata already existing within neighborhood communities.
That said, despite your low-brow dismissal, I'm not suggesting that cul de sacs are evil. They are very good at building close-knit, but very small communities. Kids that play in cul de sacs generally do so in plain view of everybody else, and with less traffic interruption, encouraging play and discouraging deviant behavior.
Cul de sac kids have a greater sense of trust with those within the immediate community, but at the expense of less trust for those outside that community -- just as isolated communities tend to do.
It is not a low brow dismissal, appealing to a HN meme doesn't save your position. :) A cul-de-sac is hardly an isolationist community. If anything you could probably go find data these people are more naive or trusting than the norm. Your position is just a rehash of the unquestioned assumptions of "suburbanites" that I think probably have a little but more to do, ironically, with "media conditioning" than even you might think.
My position doesn't apply to all, or even most suburbanites, nor is it entirely critical. I don't know why you're taking offense to it, especially offense that you haven't bothered to refute.
Cul de sacs are insular, and that's considered a selling point of them. I'll grant that they're not quite as extreme as gated communities, but that they exist for the purposes of insulating one from traffic otherwise associated with more frequented byways. That isn't a contrivance, it's their stated purpose. It shouldn't come as a shock that insulation from use as a thoroughfare would extend to insulation from outside contact, as that's the obvious result.
That said, despite your low-brow dismissal, I'm not suggesting that cul de sacs are evil. They are very good at building close-knit, but very small communities. Kids that play in cul de sacs generally do so in plain view of everybody else, and with less traffic interruption, encouraging play and discouraging deviant behavior.
Cul de sac kids have a greater sense of trust with those within the immediate community, but at the expense of less trust for those outside that community -- just as isolated communities tend to do.
[1] - http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1523709 [2] - http://chd.sagepub.com/content/20/2/229.full.pdf+html