Imagine the furore if a Guardian columnist suggested bombing, say, the Conservative party conference and the Tory stronghold of Arundel in Sussex. It would dominate public discussion for weeks. Despite protesting they were “only joking”, that person would never work in journalism again. Their editor would certainly be sacked. The police would probably come knocking. But when the Spectator columnist Rod Liddle speculates about bombing Glastonbury festival and Brighton, complaints are met with, “Calm down dear, can’t you take a joke?” The journalist keeps his job, as does his editor, the former justice secretary Michael Gove. There’s one rule for...