Broadcast media is backing itself into a culture war for reasons which seem unavoidable and yet fail a vital test of usefulness to audiences. If I tune in to a BBC news or current affairs show, from the agendas of the Today programme through to the 10pm news, am I likely to have any view I adhere to challenged or uncomfortable information or analysis tested? Or am I simply enjoined to switch into a conversation which feels like a rinse-repeat cycle of pre-agreed emphases and omissions?