It's hard to be friendly with your nearest neighbour when you spend 80 years refusing to call them by their proper name.

Equally it's not really correct for Ireland to maintain an official, unilateral claim to Northern Ireland, is it? The UK policy is that a plurality of Northern Irish citizens can decide what they want to do, which does seem more reasonable. Not that I agree with the plantation of Ulster, but it's an event from 400 years ago which we try to deal with in a fair way given modern facts. You can say historical wrongs need to be righted, but if that kind of claim was valid, the same would apply to half of the borders in Europe.