The new docudrama The People v. O. J. Simpson: American Crime Story (FX) isn’t really about Orenthal James Simpson. It’s about the trials that ran alongside his — those informal, unboundaried, court-of-public-opinion trials in which evidence was heard for and against the murder victims, the defense and the prosecution, the judge, the jury, and the Los Angeles Police Department, to say nothing of white and black America. History has freed us from suspense about Simpson’s verdict, so that the man himself (played here by Cuba Gooding Jr.) is less the tragic hero he seemed in the…