If inquiry shows that Colonel Muammar Gaddafi and his son Mutassim were summarily executed last Thursday, theirs will be the latest in a series of high-profile killings this year, beginning with Osama bin Laden in Pakistan and continuing with Anwar al-Awlaki and his bomb-making colleague Ibrahim al-Asiri in Yemen.
No one can doubt that the quick dispatch of these men was convenient. If Bin Laden had been taken to Guantanamo or The Hague and put on trial, his status would have risen again, and many more deaths might have occurred in reaction to his humiliation at the hands of America. Killing him and quickly disposing of his remains at sea had a strong, utilitarian, short-term justification.
But for the long-term, it is a very bad thing that he was assassinated rather than put on trial. The same applies to Awlaki, and it applies also, this time in the interests of Libya's future social health, to Gaddafi. The idea of the rule of law, of its due process, of the civil liberties accorded even to those we know are guilty of vile and violent deeds – indeed, the whole project of civilising the world and substituting peace and law for violence and revenge – is jeopardised by using murder rather than law to deal with such criminals.
When leading nations such as the United States act like Mexican drug gangsters, they harm themselves and set a terrible example to the world. When a nation freeing itself from tyranny uses a tyrant's methods, it gives itself a steeper hill to climb towards becoming a just and stable society.
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http://www.independent.co.uk/opinion/commentators/ac-grayling-these-executions-have-set-us-back-to-medieval-ways-2374669.html