But some Irish are Brits, so you’re going to kick them out of their own country?
They would all cease to be "British" and would be citizens of Ireland. If they wanted to remain "British", they could move to a country that is ruled by the crown. The same deal they made with the Irish.
Why don't you want the Irish to have the same right to self rule as everyone else?
The Irish have their own country, I think allowing Northern Ireland was a good compromise.