Last summer, as the death toll in Gaza climbed above 50,000, punk group Bob Vylan provoked a media storm by chanting “death, death to the IDF” at Glastonbury festival. The scene was broadcast live on the BBC and quickly racked up millions of views online. Shortly after, Avon and Somerset police launched an investigation into the group with reference to Article 5 of the Public Order Act, carrying a maximum fine of £1,000. That force “contacted hu…