Northern Ireland has no national anthem (and no flag). The UK has GSTQ, Scotland has FOS, Wales has LOOF, and there is broad consensus in England that GSTQ is the English Anthem.
The situation with Northern Ireland is that no song has ever been given any official status, and there is no common consensus over what one should be. That has lead to the confusion of the IFA playing the UK anthem, while Danny Boy is played at the commonwealth games.
It is true that unionists have never really cared what the rest of the world thought that much. In my opinion it is very relevent that the game was being shown across the world. The IRFU (and the Ulster branch in particular) obviously wanted to show Belfast in a positive light rather than as still obsessed with secterian point scorring
Just because the team plays in Dublin does not mean the north is not represented. Ulster play their games in Belfast but Cavan, Monaghan and Donegal are certainly represented (the kids game at half time yesterday was Holywood v Cavan actually, and Tommy Bowe is still a very popular guy around Ravenhill).
Because there are 3 reason Ireland won't be back to Belfast for a while
Get a life
Why would we? It pointless lobbying for change while we still have the same idiots at home. The train to Dublin is under £20 and in 90 minutes your free of the knuckle-draggers
You explained that you think there is it is an ROI team because that where they play their games. The facts are your in a minority, even among your own community. which is why when you walk round the centre of Belfast at the minute you will see bar after bar with "6 nations shown here" in the window. Its a paycheck for every bar in the city without the hassle that comes with football.
If your unhappy with the very existance of an all-island international side your never going to be happy. Good luck with that, but I'm not particularly unhappy you feel that way as Rugby is better off without people trying to find reason to be offended in everything. In the end though its cutting off your nose to spite your face. If the Ireland v Italy game at Ravenhill had been a success chances are Ireland would have been back for the occasional game, which would have been a great arguement in favour of a new stadium in Belfast/Maze.
But the O6C obviously aren't ready for live and let live. Remember that when FIFA or the Health and Safety Executive finally declare Windsor unsafe and your travelling to Scotland.
p.s. If that happens does that mean you will think of Northern Ireland as a Scottish team?