The death of German philosopher Jürgen Habermas made world headlines. An appropriate end for a man whose impact on modern western thought was equalled only by his lifelong love of knocking about ideas in the public sphere – an idea he helped define as modern democracy’s survival camp. When Habermas visited Dublin in 2010 to receive the Ulysses Medal, he outed himself in The Irish Times as a fan of the James Joyce novel, a book he called “highly self-reflective, aesthetically uncompromising ... whose allusions are almost indecipherable”. Many could say the same of Habermas, whose writings and interests over...