The attack on the Heaton Park Hebrew Congregation synagogue in Manchester was outrageous. It took two innocent lives, and several others were injured. Yet it could have happened almost anywhere. It is an event with wider national meaning and lessons. On Thursday morning, Britain looked over the edge into one of the dark places to which modern public life has been heading. Having looked and seen, Britain now needs to learn and step back.

The violence began around 9.30am, just as morning prayers were being held on Yom Kippur, Judaism’s most solemn and sacred day. The synagogue was inevitably well attended. Yet within a short period of time, two Jewish victims lay dead from stabbing, with four others injured, outside what ought to be a place of prayer and community. The attacker was then himself shot and killed, possibly as he attempted to get inside the building. He may have been armed with an explosive device.

Not all the details have........

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