Lena Waithe is the screenwriter and creator of the Showtime series “The Chi,” about the South Side of Chicago, but she tells Jelani Cobb, “Getting your own TV show is like getting beaten to death by your own dream.” Her first script for a feature film is “Queen & Slim,” directed by Melina Matsoukas. It’s about a man and woman who are on a not-great first date, during which they unintentionally kill a police officer at a traffic stop that escalates. “I just wanted to write something about us. But unfortunately, if I’m writing about us, how can I ignore the fact that we’re being hunted?” The film arrives in the aftermath two notorious police killings of black people—Botham Jean in Dallas and Atatiana Jefferson in Fort Worth—only the latest in a long line of similar tragedies. “I do not want that kind of publicity for my film,” Waithe says. “I am like every other black person. . . . Every time these stories hit our phones, a piece of us dies, because we know that we could be next.”