Sini Anderson’s The Punk Singer is a double-sided coin, with one face that’s somber and another that’s uplifting. Watching the film’s subject, feminist activist and musician Kathleen Hanna, as she takes center stage in archive footage, it’s impossible not to feel inspired by her energy and indomitability; for most of the film, Hanna gives the impression of being an unstoppable force, though anyone familiar with her life and times already knows this to be untrue without having to watch the entire picture. And so The Punk Singer exists as a work that’s simultaneously joyful and tragic, though that contradiction only makes Anderson’s film feel even more transparent and honest. For…