From a friend's blog post on Avatar:
People applauded at the end of the film, which I found a bit disturbing. Visually, it was awesome. But we just saw humanity slaughtered on an alien planet. We just saw the greed of humanity at its worst. We just saw a terrible spirituality exalted as ideal. And, finally, we just saw the remnant of the humans sent back “to their dying planet,” and we cheered.
No wonder people feel depressed after stepping out of the theater and back into reality. We are scum. We are parasites. We deserve to die on this rotting planet for our sins against Mother Earth.