Some philosophers have tried to base morality on human nature, but what does biology say about that?
In his 1945 public lecture 'Existentialism is a Humanism' Jean-Paul Sartre made a bold claim: for human beings, existence precedes essence. We exist, then we choose how to be. This is as opposed to a chair, for example, which is designed to fit a particular purpose and then brought into existence to fulfill that purpose. The chair has an essence that precedes it; it has a "chair nature" that it is created to conform to.
Any story we tell of our species, any science of human nature, that ignores how important stories are in shaping what and how we think and feel is false. We evolved to be ultra-social (and self-deficient), so we care deeply about character and plot.