The most frustrating aspect of Todd Haynes’ drama Dark Waters isn’t that the story is unimportant. On the contrary, it’s incredibly important. What makes it so damn depressing is that we’ve seen it again and again. We saw it with A Civil Action. We saw it with Erin Brockovich. There’s no shortage of movies based on a true story of powerful companies poisoning citizens and the legal system being too slow and too overwhelmed to effectively combat such behavior. So here is Dark Waters with this story again as it recounts how corporate defense attorney Robert …