OAKLAND -- As the hour approaches for a jury to decide the fate of former BART police officer Johannes Mehserle, thousands of Oaklanders hope to experience what seemed so unlikely to them 19 months ago: Justice for Oscar Grant. But what is justice? What constitutes a just response to the killing of the 22-year-old grocery store worker, a man memorialized in hip-hop songs and murals, discussed in barbershops and living rooms as an iconic victim of police brutality that some say happens all too often? Grant was among a group of revelers returning from San Francisco on New Year's night...