Oddly, I like this answer. As a social value, it can bring out the best and worst of our nature. There are millions of invisible men like this roaming around. Marginalized, forgotten people. The ones who are cast into the loser pool of a success based culture. Many have severe mental illnesses. We just put our head down and hope they won't snap one day. Hope that they will remain the unpleasant background noise to our daily routines.
It is a lesson one learns early on the subways. Keep you head down, mind your business, no eye contact. The problems happen when everyone does ignores the problems and puts their collective heads down. One day you may get shoved in front of an oncoming train. Maybe the weird kid you had home room with decides to take some people down with him.
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