Set in the Bedford-Stuyvesant neighborhood of Brooklyn, “Monsters and Men” provides back-story for the experience of the police and the poor, in a world tilted off its axis by gun violence.The film is a hushed and somber triptych. Its visual texture and soundscape are reminiscent of the 2017 Best Picture-winner “Moonlight.”Written and directed by Reinaldo Marcus Green, “Monsters and Men&rdquo …