And we have a long history of living and functioning in very crowded environments; such as the gun decks of Nelson's frigates and Calcutta slums.

But it cannot be denied we were designed by evolution to live in small bands of one or two dozen individuals which only occasionally interacted with other bands. Even in historical times, most of humanity has lived in agricultural villages or compact city neighborhoods, an environment where everyone you knew also knew each other; i.e., a real community. With the advent of modern transportation and communications, this has all changed. I don't doubt this has had a negative effect on individual and group dynamics.

Country kids live in a wholesome, tight-knit community of shared values and traditions. City kids are street smart and alert, open to new experiences and social contacts. Everybody knows suburban kids are all fucked up.