“The Deutsche Oper’s production of Mozart’s ‘Idomeneo’ (1781), which contains a severed head of the prophet Muhammad, passed off peaceably. A small group of Christians quietly held placards before the show. During the performance, there were two gentle ‘boos,’ countered by two polite ‘bravos.’ After so many overheated jeremiads and terrorist warnings in the press, it was a bit of a let-down.”