"I hope James Mattis sees this film," says Michael Epstein, director of House 2, a feature doc about the Haditha massacre and the subsequent criminal investigation, which was the most expensive in Marine history. "I hope he realizes truly how fucked up it is and goes in and fixes it. Now as Secretary of Defence, he's in a position to something, he can find out what really happened and hopefully he really will." House 2 tells the story of a criminal defense attorney and an…