Last Saturday afternoon, as part of the BBC’s routinely excellent coverage of Glastonbury, the station broadcast a live performance by Bob Vylan. Many people who watch Glastonbury each year might never have heard of Bob Vylan, but most now know what happened next.  After leading the crowd in a chant of “Free, Free Palestine”, the band’s lead singer, who goes by the stage name Bobby Vylan but whose real name is Pascal Robinson-Foster, moved to another chant. “Have you heard this one, though? Death, Death to the IDF.” The analysis that was part of the frenzy that followed touched not…