Why won't the English get out of northern Ireland?

The Northern Ireland populace is composed of mostly English and Scottish borderlanders by descent. They have been there since Oliver Cromwell and the plantation period.. about 400 years now. During the Scottish diaspora to the new world… Northern Ireland lost a lot of its protestant settlers… this allowed for more admixture between the Irish and British… but even to this day… the British population hasn’t been incorporated into the Irish whole. Though the residents rightfully call themselves Irish by regional desciptive… they are Britsh by lineage.

I understand why Irish people detest the encroachment… the plantation period was a hostile period of history. Like others have said… the British have been there for quite some time now… and history writhes with nations of people invading other nations land and settling… right and wrong are a matter of which point of view the opinion is coming from. Being descended from those plantation settlers… my point of view… Northern Ireland’s population deserve the right to sovereignty… or political union… despite what the rest of Ireland wishes.

The Ulster Scots have an argument that Northern Ireland being the homeland of the Scoti… a return to their ancestral birthplace… Dál Riata… is as legitimate as any Irish claim.