There is a wry joke in Joyce’s Ulysses that betrays a dark reality of Ireland’s history: “Ireland, they say, has the honour of being the only country which never persecuted Jews ... and do you know why? ... because she never let them in”. Indeed, there are very few Jews here. I have borne witness to two things in the past few months. Firstly, how easily one can dehumanise a group of people when they are an abstract. Secondly, the human capacity for extreme cruelty when one believes there will be no consequences. My Jewish ancestors, who were ethnically cleansed...