Perhaps it could be quelled by telling the truth, that the whole world knows, to the Ulster Protestants:
We "planted" you in Ireland centuries ago from Scotland. You were anti- Catholic. Being masters of the doctrine of "divide and conquer" we exploited your religious bias for our own ends. When we lost part of Ireland we had to redouble our efforts in encouraging you. We wanted to hold on to the Belfast shipyards and the factories that were English-owned. You were a source of cheap labour; you accepted for decades wages lower than your English counterparts.
Your culture is a myth that we created, used and exploited.