Many people accept that, to protect public health, it is sometimes acceptable, or morally obligatory, to restrict people’s liberties. But there’s a lot of disagreement about how far these restrictions should go, and whom they should apply to: everyone, or certain groups of people only? In this Thinking out Loud interview, Professor Julian Savulescu (Uehiro Chair of Practical Ethics, University of Oxford) defends the view that we should only restrict the liberties of those vulnerable to COVID-19. (Interview and editing by Katrien Devolder, Oxford Uehiro Centre for Practical Ethics.)