Not yet Detroit, though  POWERED by jobs at Amazon and
Starbucks, Microsoft and the Gates Foundation, Seattle has
become a famous brain-gain city. It attracts college-educated,
mostly white incomers who cycle to work in the rain, attend the
ballet in inordinate numbers and brood over iPhones in 1,640
coffee shops.  Until this spring their greener-than-thou, over-
caffeinated lives were seldom stirred by the gun violence that
intermittently roils much of America. Then the bullets started
flying. A mass killing occurred in, of all places, a coffee
shop. Suddenly, the smart city felt scary.  Nicole Westbrook, a
culinary student who had just moved to Seattle from Albuquerque,
New Mexico, was killed in late April by a bullet fired from a
passing car. She was walking with her boyfriend in a district
known for its art galleries. Justin Ferrari, a software engineer
and water-polo coach, was shot in the head on May 24th while
driving with his two children and his parents. He died in his
father's arms, caught in the cro