Your right Streido, the British Army was hamstrung by dealing with PIRA (or the more numerous loyalists paramilitary's) in a way that they didn't want to, as terrorists, had they truly operated a shoot on site war like campaign (one can think back to the Boer wars in South Africa) and been given a free reign it would have ended much sooner but would have been wrong in many ways (thinking of the Boer war again) The trouble is if you treat it as a war you do wrong (Boer concentration camps), treat it as terrorism and it makes putting and end to any 'violence' much harder.
The majority of Catholics in NI wanted a peaceful resolution, which is why only a minority of them voted Sinn Fein during the troubles, the Majority did not, once the terrorism stopped the lot of the many people in NI on both sides has been vastly improved, so the terrorists held up that advancement for 30 years, well done them, I bet 2 whole generations are pleased with that......
Before you get the wrong idea though, I have no more time for the 'Loyalist' (Oxymoron) thugs either.