The key to living in a city and peacefully co-existing as a social animal in tight quarters is to set a delicate balance of seeing and not seeing. You take care not to step on the heels of the woman in front of you on the way out of the subway, and you might take passing note of her most excellent handbag. But you don't make eye contact and exchange a nod. Or even if you do, you make sure that it's as fleeting as it can be.
I once asked a Japanese friend to explain why so many people on the Tokyo subway wore surgical masks. Are they extreme germophobes? Conscientious folks getting over a cold? Oh, yes, he said, yes, of course, but that's only the rubric. The real reason to wear the mask is to spare others the discomfort of seeing your facial expression, to make your face into a disengaged, unreadable blank--to spare others the discomfort of firing up their mirror neurons in order to model your mood based on your outward expression. To make it possible to see without seeing.
Crazy, desperate, violent people don't make rational calculus in regards to their lives. Anyone who becomes a junkie, crack dealer, or cellphone-stealing stickup artist is obviously bad at making life decisions. They're not deterred by surveillance.
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