Yes, it was right of the police to announce quickly that they did not think terrorism was the motive in Monday’s Liverpool horror, thus heading off potential riots. The police also said the person arrested was a white man. If he had been a black man, would they have said that? If not, why not? Watching film of the incident, I felt uneasily reminded of the scene in Belfast in 1988 when two British soldiers in civvies drove out of a side road and........

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