What do the producers of “Game of Thrones,” Kathryn Bigelow and the painter Dana Schutz have in common? Each was recently at the center of a roiling controversy about what it means for white artists to make work about black people’s suffering. David Benioff and D. B. Weiss., the creators of “Game of Thrones,” recently announced their next project: a series for HBO called “Confederate,” which imagines life in the United States if slavery had never been abolished. The news triggered a firestorm on Twitter, with some people calling for the show’s cancellation. “Detroit,” a new film about racial oppression and police brutality during the 1960s, made by Kathryn Bigelow and Mark Boal, has also caused controversy. When asked by Vanity Fair if she was…