It goes without saying that what happened is a disgrace. As the article says, the perpetrators attacked the first people they came across. Several people were admitted to hospital - six people, if I recall correctly. I heard the wife of the deceased man speaking on the radio this morning. She mentioned that with her and her husband was a pregnant lady. People were imploring the attackers to stay away from her because she was pregnant, but this fact had no effect and they continued their beatings with impunity.
I must say, however, that I am rather curious about some of your comments, Bobzills. “Time and time again we see Protestants in N. Ireland marching and attempting to provoke Catholics” - it is important to remember that, while the British occupation of Northern Ireland may be ultimately at the root of the problem, the violence has come from both sides of the divide. Catholics have not been the sole victims of the Northern Ireland violence - not by a long shot. You then ask “why are they in Ireland in the first place?” That question is asked after you have mentioned provokation by Protestants, and hence it seems that you are asking why Protestants are in Ireland, whereas, after asking the question, you refer to the British. These are two very different issues and the history of Ireland shows that Protestantism does not equate to “Britishness” or Loyalism, nor does Catholicism necessarily equate to Nationalism. Some of the greatest figures in our history have been both Protestant and Nationalist - our first president, Dr Douglas Hyde, for example, came from a Protestant family (his father was an Anglican rector), and the Nationalist leader, Robert Emmet was also from a Protestant background. Some of the greatest supporters of Irish culture - especially the Irish language - have been Protestants.
Even if your question was meant to read “why are the British in Ireland…”, I think in the context of the article, such a question is irrelevant. Northern Ireland is in the best state that it has been for decades. The political situation has improved so much - even I have seen that in my short life! I don’t even think that it’s politics or religion that’s at the root of these outbursts of violence. It seems to me that it is, plain and simple, thuggery. However, I do believe that history has a part in this thuggery, but only in the sense that in the past, divisions were an excuse to cause violence and people got away with it. “Sectarianism” has become an excuse for any violence which occurs in the North. It normalises violence - it can’t just be that a man was brutally murdered; rather a Catholic was murdered by a Protestant, hence it was for political/religious reasons, hence it’s more understandable, and it seems that the culpability of those hooligans is diminished.