Educational approaches to counter-extremism are proliferating globally, claiming to foster ‘critical thinking’ amongst those deemed vulnerable to extremism. These projects ‘make sense’ through two mutually-reinforcing discourses: a psychological discourse that adjudicates the moral value of different ways of thinking through scientific measures; and an ethical discourse of liberal education that idealizes critical thinking as essential to human development – becoming more human and humane. Counter-extremism mobilizes both to over-represent a ‘dominant genre of being’, to take Sylvia Wynter’s phrase, as if it were the only way of being human. Such projects show how expert and everyday understandings of ‘critical thinking’ have been shaped by psychology’s history as a race science and liberal understandings of education that have legitimated hierarchies of being human. I argue that these conditions of possibility that shape critical thinking must be grappled with in any critical pursuit against hierarchies of being human.