They say three makes a trend and US television was convulsed last week by a trio of scandals and sudden sackings that cast a harsh spotlight on a too often toxic workplace culture that floods the top echelons of TV land in America as surely as the fill-in lights of a broadcast studio. It also helped cost the jobs of three of the biggest names in the media landscape as well as convulsing some of the most powerful media empires in America. The first head to roll, at midday on Monday, was the powerful rightwinger Tucker Carlson, Fox News’ 8pm...