"a fascinating op-ed piece last year, T. M. Luhrmann noted that when schizophrenics hear voices in India, they're more likely to be told to clean the house, while Americans are more likely to be told to become violent. Culture matters. Or as my friend, the criminal-defense investigator who knows insanity and violence intimately, put it, "When one begins to lose touch with reality, the ill brain latches obsessively and delusionally onto whatever it's immersed in--the surrounding culture's illness."