Longtime activist/filmmaker Connie Field (The Life and Times of Rosie the Riveter) follows the Kronos Quartet’s production of Jonathan Berger and Harriet Chessman’s opera My Lai, which takes at its heart the actions and life of Hugh Thompson, the “whistleblower” helicopter pilot who revealed the 1968 massacre by US troops in Vietnam. Tackling the concept of heroism, the definition of morality in wartime, and guilt both personal and national, The Whistleblower of My Lai is not only a film on opera and the process of creativity, but a work on the nature of humanity itself.