Those matters are hardly absent from “Fruitvale Station,” Ryan Coogler’s powerful and sensitive debut feature, which imaginatively reconstructs the last 24 or so hours of Oscar Grant’s life, flashing back from a horrifying snippet of actual cellphone video of the hectic moments before the shooting. But Mr. Coogler, a 27-year-old Bay Area native who went to film school at the University of Southern California, examines his subject with a steady, objective eye and tells his story in the key of wise heartbreak rather than blind rage. It is not that the movie is apolitical or disengaged from the painful, public implications of Mr. Grant’s fate. But everything it has to say about class, masculinity and the tricky relations among different kinds of people in a proudly diverse and liberal metropolis is embedded in details of character and place.