Death culture is typically used for modern society, a society driven by nihilism (the belief as expressed by Nietsche that everything doesn't exist in the end and thus doesn't matter). A culture without a purpose is thus "dead" and people who promote such a culture are known as "walking zombies", the "walking dead" or "the un-dead".
"Screw capitalism. It's all death culture in the end."
"Get your death culture out of my face. I have a purpose in life and it's not you."