Scott Cooper (Black Mass) is a writer/director who always delves into the gritty underbelly of the US, casting an unflinching eye over its history and social traits. With Hostiles, he moves into the Western genre, and right from the shocking opening sequence, you know you are not in for a good ole boy, John Waynesque movie. And while he does occasionally move into the realm of cliche and generic storytelling that lurks in all his movies, I can’t help but admire his take on Donald E. Stewart’s (Patriot Games) manuscript and this much-flaunted genre, as he’s taken great pains to…