[RayChuang88]

Roland Sturm obviously has NOT lived in New York City with its high-density population and high-stress living environment.

[GSlob]

"Roland Sturm obviously has NOT lived in New York City with its high-density population and high-stress living environment."
Some time ago I read that when laboratory rats (that's the rats with small "r") were kept in cages with population density above certain threshold they became psychotic and resorted to cannibalism. Something similar may apply to humans as well. There is only so much stress a living being of any species could take before breaking. And frequency of such breaks is greater in high stress densely populated areas.