Shortly after Donald J. Trump’s inauguration in January 2017, Tabitha Jackson, then the director of the Sundance Institute’s Documentary Film Program, was hosting the annual opening reception for documentary filmmakers at the festival in Park City, Utah. The British Ms. Jackson, who is mixed race and gay, took the stage, knowing many in the audience were unsettled by what had happened and what was ahead.She struggled to find the words to convey what people were feeling. Instead, in a reverse Samson moment, she asked the filmmaker Sandi Dubowski (“Trembling Before G-d”) to start chopping off her dreadlocks, which …
