Honestly?

"Honestly? I think the world's gonna end bloody. But does that mean we shouldn't fight? We do have choices. I choose to go down swinging"
-Dean Winchester, Supernatural

In a metaphorical sense, I agree. I don't think we should spend every waking moment trying to prolong our own lives and create a false sense of self-righteousness for all mankind. I think man is inherently sinful, and that this earth will eventually pass away. But I also think that God has set eternity on the hearts of men. I think that God actively intervenes in this world and in the lives of people. Good exists, and we can join God in his good work. If we try to save ourselves or this world, our lives and our legacies will end with the world, whether or not we choose to go down swinging. But we can also fight to give it all up to God in exchange for something greater. If we fight this fight, we don't have to go down at all.