WE'VE all heard the hypotheticals. They are common in the aftermath of any racially charged incident, and the Inglewood police beating of 16-year-old Donovan Jackson is no exception. It's an old guessing game: How would the public's reaction, the media's coverage, the politicians' response differ if the racial tables were turned? Would Johnnie Cochran and Al Sharpton rush to the aid of Jackson, an African-American teen beaten by a white officer, Jeremy Morse, if Jackson were white and Morse were black? Would the story command national attention? And would the awful episode have ever happened at all -- that is,...