If you took a Sunday newspaper op-ed on Chicago gang violence and tried to turn it into a feature-length motion picture, you would get something like “Chi-Raq” (2015). I don’t fault Spike Lee for trying. It’s a worthy subject and his idea of using the ancient Greek play “Lyisistrata,” in which women use sex as a weapon – withholding it until their men declare peace – is inspired. But as a movie, it seemed more like an unfinished work. Lee has a bunch of creative ideas he is trying to work out on film, but never develops any kind of narrative flow.