WARWICK, England — THE British do not torture. At least, that is what we in Britain have always liked to think. But not anymore. In a historic decision last week, the British government agreed to compensate 5,228 Kenyans who were tortured and abused while detained during the Mau Mau rebellion of the 1950s. Each claimant will receive around £2,670 (about $4,000). The money is paltry. But the principle it establishes, and the history it rewrites, are both profound. This is the first historical claim for compensation that the British government has accepted. It has never before admitted to committing torture in any part of its former empire. In recent years there has been a clamor for official apologies. In 2010, Britain formally apologized for its army’s conduct in the infamous “Bloody Sunday” killings in Northern Ireland in 1972, and earlier this year Prime Minister David Cameron visited Amritsar, India, the site of a 1919 massacre, and expressed “regret for the loss of life.”