Addressing the human-made problems of the 21st century requires rethinking the aims of social and developmental psychology. It requires scholarship that seeks not merely to describe how humans develop but one that aims to intervene in how humans develop. More fundamentally, it requires resisting the widespread idea that there are causes of human behaviour (socialisation, history, culture) that push us mechanically from the past into the future, and instead focus on humans as world-makers. Either by accepting the status quo or resisting it, humans must take responsibility for the world of tomorrow. The question for social psychology is not what causes human behaviour or even how human behaviour changes and develops, but rather what type of people we want to be. Such a pragmatic and genetic social and developmental psychology would be doubly genetic: it is not only about change but also about enabling humans to critically reflect on and collectively guide these changes. Specifically, it needs to critically challenge and expand the possible, ensure that world-making tools are fairly distributed and create theories of human behaviour that encourage a richer humanity.