Some good comments.

Just for the record the Protestants who led early Irish nationalists were mostly Anglo-Irish and Church of Ireland (basically Episcopalian) not Ulster Scots (Scots-Irish if you prefer) Presbyterians. The former were, again generalising, mostly upper class and quite liberal and cosmopolitan compared to the rest of the Irish both Protestant and Catholic. (The Ulster Scots were active in the ‘pro-liberty’ movements in the late 19th century and supported the rebelling American colonists unlike most Anglo-Irish and the Irish Catholic Church, which supported the Crown.

However, when the Rising became about religion and blood – see the Scullabogue barn massacre – not ideas, virtually all Protestants, including the Anglo-Irish, turned against Irish nationalism.

In the late 19th and early 20th centuries the liberal sophisticated Anglo-Irish elites again took up various forms of Irish nationalism, which they were sure, this time, would be non-sectarian thus allowing their families to remain, if not in charge, then still part of Ireland’s elite.

Nearly a century after partition those Anglo-Irish, who seriously thought nothing would change for them after Irish independence, don’t exist as a distinct people anymore. Most eventually left Ireland or disappeared into the Irish mainstream. But the Ulster Scots, whom the Anglo-Irish usually dismissed as unsophisticated and too stubbornly resistant to change, still exist.