Thank you for your citation of a source I can in no way verify. When it comes to casualty numbers from conflicts like these I don't trust them without having a sense of the methodology used-- the numbers tend to fluctuate wildly based on the political leanings of the source.
The source is pretty much the definitive, universally accepted chronicle of every death of the Northern Ireland conflict, detailing each killing, from every side, Republican and Unionist, giving a biography of each victim, and done neutrally.
For almost twenty years Malcolm Sutton has been recording the details of every death arising from the present conflict in Ireland. He has collected newspaper cuttings, observed funerals, checked coroners' court records, visited cemetries and studied books and pamphlets. He has painstakingly verified the personal details of victims, the organisations responsible for the killings and the circumstances in which the deaths occurred.
Of the total deaths, 3,271 have occurred in Northern Ireland, 115 in the Irish Republic, 125 in Britain, and 18 elsewhere in Europe. Republican groups have been responsible for 2,060 of the deaths, Loyalist groups for 1,016, British Forces for 363, and the Irish Republic’s Forces for 5. For the remaining 85 deaths, it has not been possible or appropriate to identify the killing group.
http://www.cain.ulst.ac.uk/sutton/book/index.htmlUnionist and Republican groups both carried out atrocities as did the British army on occasion.
The most generous thing you can say for the para-military groups of Ulster is that they were culpable for the deaths of innocents through general indifference and a calculus of 'acceptable cost' in their strategy.