All manner of reasons. It is a moot point that the methods used by the British Army and the police (RUC) to counter terrorism and associated criminal activity would suit the normal problems of urban mainland UK, including gun crime. Northern Ireland was a very intensive environment, notably urban West Belfast and rural South Armagh, where amidst a largely un-co-operative public PIRA operated. The latest knife murders of teenagers in London for example are quite different.
Applying COIN, even CT methods to mainland policing and in the USA I venture to suggest are not appropriate. I have my doubts that police managers would accept, even understand, COIN.
davidbfpo
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