Most film directors want to create a piece of art which may or may not be inspired by real or fictional events. Most films based on novels don't slavishly follow the original writing - that's not the way to make a successful film. Art pieces often take liberties with earlier works, and why not? It may upset some people to view a film which doesn't stick to the original plot or character list, but I don't think there's anything inherently wrong or sinister about what goes on. The film will be judged on its merits. Artistic licence, creativity, innovation, adjustment to changing times; all the essence of art.