"The world is over. It can't be cured, it can't be salvaged, it can't be saved." (2.7.179)
This is the attitude that's destroying the planet and, in Warm Bodies, destroying humanity itself. These are the people who think there's nothing we can do to stop global warming/social injustice/economic inequality/take your pick, so we just keep trundling toward the apocalypse, slowly and surely. Like a steamroller.