Its scaremongering to put forward your view as a done deal and that this is going to happen.
I think we need to be honest here.
We promised to respect the Good Friday Agreement. In December Theresa May agreed to a backstop that was supposed to ensure that the Good Friday Agreement was respected and that there would be no hard border in Ireland. Boris Johnson or David Davis (can't remember which) immediately tried to renege on that.
The only way to avoid a hard border is for Northern Ireland to remain in the single market and customs union. This is a legal reality. We can't agree to different treatment for Northern Ireland without pissing off the DUP (on whom Theresa May is politically dependent) and causing Scotland to kick off about independence again. The Tories have ruled out the possibility of the UK remaining in the single market or customs union.
These are unavoidable facts, not scaremongering.
What is the solution? I can't see one.
And lets be honest re NI borders, maybe just maybe if the politicians had taken the referendum seriously in the first place they may have put that forward as a major point instead of an add on at the end when they suddenly started listening to the polls that said they might lose.
Yes, absolutely it should have been a major issue. We shouldn't have held the referendum without a plan for the border issue, and we definitely shouldn't have triggered Article 50 without one.
But we did.
The fact that parliament dropped a bollock on this one or simply doesn't give enough of a shit about Northern Ireland to worry about it doesn't change the fact that this is a dealbreaker.