After a second stabbing spree by a paroled jihadist in less than three months, the British government is reconsidering its early-release policies for people convicted of terrorist acts. Bully for the Brits, but what’s taken them so bloody long?

Last November, Usman Khan murdered two people in a terror attack near London Bridge and then was killed by police. On Sunday afternoon, fellow Islamic extremist Sudesh Amman strapped on a fake suicide belt and knifed two random pedestrians before also being shot dead by authorities....