The British army were sent to NI at the request of the Unionists as the brave men and women of Derry were routing the RUC on the streets in 1969. It was a colossal mistake by the British, and against all the advise given to the government at the time. Instead of addressing the sectarian genocide going on, the British set the 30 year conflict in motion and are 100% responsible for all that happened afterwards.
Harold Wilson 1969 " If it became necessary for troops to intervene, they would be thought to be doing so in order to maintain the orange faction in power. The constitutional consequences might be very grave, and once we were involved it would be very difficult to withdraw."
The bastards knew the outcome, but still did it, to defend fascism.