Who must stay outside?

The Special Focus on invitation policy at universities contains a target article by Romy Jaster and Geert Keil, five commentaries, and a response. The question under discussion is what disqualifies a person from being invited to speak at a university. On liberal, Millian approaches, the epistemic benefits of free speech preclude no-platforming policies. More restrictive approaches demand the exclusion of speakers who are considered racist or otherwise hostile against marginalized groups. Jaster and Keil take a virtue-based approach to invitation policy: A person is ineligible as a speaker if she exhibits specific intellectual vices that are detrimental to the pursuit of truth, the university's raison d'etre. The five critics raise various concerns. Birgit Recki deems the virtue-based approach too restrictive: It is prone to exclude some speakers who make intellectually stimulating contributions. Eva von Redecker and Daniel Loick deem the criterion too permissive: It allows for contributions that should have no place on campus. Dieter Schonecker and Maria-Sibylla Lotter object that the approach is silent on all recent actual cases of 'cancelling' at universities. In their response, Jaster and Keil address these concerns and clarify their position.