“Without an honest confrontation, there is no healing.†That’s from Birth Of A Nation director-producer-star Nate Parker today onstage at the Sundance Film Festival. In what I have to say was one of the most emotional experiences I’ve had at a movie theater, Parker world premiered what he called his seven-year “passion project.†His telling of the early 19th century slave revolt led by Nat Turner had audience members crying in their seats and jumping to their feet in a prolonged standing ovation at the film’s conclusion.