The future Earth we see in Interstellar is a post-apocalyptic society. The population of the planet has been reduced to just a fraction of its current level. There have been wars and food shortages. And now the planet is dying and the human race is on its way out.
But instead of showing a dog-eat-dog battle for survival in the wasteland, we see people just getting on. It goes against the conventional wisdom that presupposes that if our Hobbesian Leviathian of civilisation were to be destroyed, our lives would inevitably revert to being nasty, brutish and short.