Nightcrawler is about a freelance news videographer who hunts down the most graphic shots of mangled bodies and still-warm blood he can find, and then sells them to local television news. He becomes quite good at his craft and makes lots of money. And if that was all it was all it was about, it would be a compelling condemnation of our current media culture.
But it's about much more than that. And as such, it is far more compelling and far scarier.