A person may justify their vote by saying it is purely on one issue, ie the Union.
But the reality is, you vote for a party, you get the whole package. They are not to know it is qualified vote and you don't actually approve of their other policies. They are in fact totally emboldened on all fronts by the vote they get and act on it .
People in NI are in the Union.
They cannot be taken out the Union by trickery. Everyone has signed up to the principle of consent and the right to self determination of the people in NI.
Article 1 (ii) of the Good Friday Agreement says that the participants recognise that it is for the people of the island of Ireland alone, by agreement between the two parts respectively and without external impediment, to exercise their right of self-determination on the basis of consent, freely and concurrently given, North and South, to bring about a united Ireland, if that is their wish, accepting that this right must be achieved and exercised with and subject to the agreement and consent of a majority of the people of Northern Ireland
So really, I find the justification of voting for a party like the DUP on the basis of worry about the Union to ring a bit hollow tbh
Surely it is possible to be in favour of the Union without the nasty social policies?