In recent years behaviours on university campuses have created widespread unease. Safe spaces, trigger warnings, and speech codes. Demands for speakers to be disinvited. Words construed as violence and liberalism described as ‘white supremacy’. Students walking on eggshells, too scared to speak their minds. Controversial speakers violently rebuked – from conservative provocateurs such as Milo Yiannopoulos to serious sociologists such as Charles Murray, to left-leaning academics such as Bret Weinstein.