This paper addresses a question posed by the increase of democratic backsliding: whether democracy itself is compatible with human nature. It analyses democracy as a layered system consisting of three levels: the political/institutional, the social/interactional and the psychological/intrapsychic. At each level it uses evolutionary theory to describes features of a ‘light side’ of human nature that makes democracy possible, and of a ‘dark side’ of human nature that leads to democratic backsliding. At the political/institutional level these features are the reduction (...) of reactive aggression and the capacity for the intragroup stranger. At the social/interactional level they are the cultural evolution of cooperative norms and an inclusive group identity. At the psychological/intrapsychic level they are the coherent, continuous positive self-experiences produced by shared positive emotions. However, these mechanisms can misfire at each level, producing the dark side that leads to democratic backsliding. (shrink)