Saving the world is an impossible task therefore a counterproductive task for yourself. A better question would be why isn't your stance "I don't care"?
Trying to save the world isn't really about saving the world. It makes me feel better about myself, like charity work.
That may be true, but evolution is not singular. No one single individual can evolve no matter what level of ignorance they have. It takes an entire species to evolve.
The only beings in the universe that evolve singularly are pokemon.
The side of believing in God and that he created everything vs. the side of thinking we're just here for no reason and just randomly appeared here.
All are hard to believe.