I would just leave morality out of it. The universe exists, with or without us, just as Earth has and will. All you can do is live your life in the world you find yourself in and make the most of it before you, and the rest of us, are eventually gone.

For me that means living my life, doing what I can to be kind and make others happy because that's what I enjoy doing. Nothing I do will really matter though, in the long run. But that's OK. Why does it have to matter?