It is never going to be possible to protect people absolutely from the actions of disturbed individuals. As a rule, we do a better job of it in Europe than in the United States, where the availability of guns makes any suicidal sociopath a potential mass killer. But every time people are killed, as in the London Bridge attack on Friday, lessons must be learned.

One of the obvious lessons in this case is that there was insufficient scrutiny of the case of Usman Khan, the convicted terrorist who was let out of prison early and who fatally stabbed two people in central London yesterday. 

It should be accepted that the sentencing rules were unsatisfactory if they allowed Khan to be released automatically, provided he met minimal conditions. But, as Robert Verkaik writes today, the demand for “tougher” sentences is simplistic if it simply means longer ones. That merely postpones the problem at the cost of some injustice to those prisoners who can be reformed. 

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