Last week, while sipping my coffee at a café, I overheard a troubling conversation. A small group of seemingly well-informed Brooklynites were discussing the recent shooting at the Navy Yard in Washington. One of the smartly dressed guys chimed in, “He’s schizo! That’s why he did it. Schizophrenics kill people all the time!” His friends laughed and agreed with his reasoning, and moved onto the more compelling question of what to eat for lunch.