Another web page goes into some detail on that. Is Evolution Science? I've already blasted big quotes from it inline elsewhere so you'll excuse me if I don't repeat the practice. Don't want to get like medved.
Why concern yourself with mankind? Relative morality? What does it really matter after death? Surely no one has commanded this of you except yourself.
An atheist may be blind, but they cannot be morally hypocritical and still be an atheist. They could not be true to their nature.