[...] there comes a time when the reality of crime and the reality of terrorism may mean that some of that balance needs to be readjusted, said Mark Gardner, spokesman for Community Security Trust which provides extensive protection to Jewish synagogues and schools throughout Britain. The Trust started operating in 1994 after a car bomb attack on the Israeli Embassy in London injured roughly 20 people and a devastating attack on a Jewish cultural center in Buenos Aires, Argentina, killed 85 people. [...] the challenge of protecting churches, synagogues, tourist haunts, beaches, summer festival sites, airports and train stations is among the most daunting tasks security forces have faced in recent times in France, and Europe. French Interior Minister Bernard Cazeneuve visited security forces sent in Friday at the start of a famed two-week jazz festival in the village of Marciac in the Gers, an annual treat for hundreds of thousands of jazz lovers — but a high-risk event for police. Some of Rome's more famous churches and basilicas already figure among the more than 4,000 places in Italy deemed at particular risk for extremist operations, but the French attack has also brought attention to the vulnerability of little-known churches in outlying neighborhoods. In Britain, where the overall threat level is judged "severe," police have warned Christian religious institutions throughout the country to be extra vigilant, and even small rural parishes are expected to take note and review procedures and defenses. "[...] more security measures for every place of worship in the country are absolutely inconceivable and unfeasible," he said. Since the priest was killed, Muslims in France and elsewhere in Europe have stepped forward to embrace the nation's Catholics in a way rarely seen, an act of bravery because the Islamic State group views Western Muslims as the enemy, too.