Prof Richardson, from County Waterford in Ireland, is on the record as saying she would have joined the IRA “in a heartbeat”. But does she agree extremist views deserve platform even if they offend? She says: “The default is that we should be very permissive unless someone is inciting violence, unless somebody is inciting breaking the law.” What about groups like Cage, which have been labelled “terrorist apologists”? The expert on terrorism says: “Provided that they can be countered, I think that we should let them be heard.”