Rarely do I want movies to be longer. But there’s enough that’s great about Patriots Day – director Peter Berg’s procedural thriller about the Boston Marathon bombings – that suggests how great it might have been if given a more expansive presentation à la FX’s 10-part docu-drama The People v. O.J. Simpson. Heaven knows Berg had the cast to pull it off – with one exception. One major, infuriating, movie-wrecking exception.