David Letterman is about as pessimistic as I am about climate change. But what's terrifying is the crowd's reaction. They think this is just Dave doing a bit... I don't think that's it at all. I think Letterman is actually angry, actually scared, and actually trying to get through to people, and all he's getting is laughter.
That's the problem we face: rather than actually confront the nature of what we're doing, we're far more comfortable laughing when a trusted nightly figure tells us that our civilization is the walking dead.