The 2016 Peace Accord signed between the Colombian government and the FARC-EP guerrilla was narrowly rejected by the public in a polarising referendum. This article focusses on government officials in the Office of the High Commissioner for Peace, the government institution in charge of peace negotiations, and explaining the peace process to society in an innovative strategy called ‘peace pedagogy’. These officials resorted to rational communication about peace and repudiated the accord’s opponents, whom they perceived as right-wing populists. They then self-critically analysed the referendum loss as due to their strategy being ‘too rational’ and ‘not emotional enough’. Drawing on the anthropology of liberalism, this article characterises these officials as ‘culturally liberal’: liberal ideology was enmeshed in their cultural worldviews, including a perceived binary between rationality and emotions, and a contractarian imaginary of state-society relations as above politics. This both contributed to the loss of the referendum, and confounded their attempts to analyse the result. The normative model of the social contract, enmeshed in real-world interpretations of state-society relations, thus creates inexorably political effects.