Stephen King, America’s most popular fiction writer, is an expert at writing books and stories that get adapted into films, the majority of which are horror. King’s excellence at horror I attribute, at least in part, to his frank recognition of evil as a powerful force in society. Evil in his books is something we participate in, whether we want to or not. The latest King adaptation is called The Long Walk, directed by Francis Lawrence and adapted by JT Mollner from a 1979 book that King wrote under the pseudonym Richard Bachman. In the future, a terrible civil war…