"t will be the fault of the Irish government and its political choices".
No it most certainly will not be - it will be the fault of whoever drew a line across Ireland designation a large slice of it to be British - how unnatural is that
As it stands, Brexit has already begun to eat into the economy of Ireland, both north and South - installing a hard border would accelerate that substantially
Britain has deliberately used the DUP to push Brexit through - how on earth do you expect the Irish people to react to that ?
There really is a chance of a reawakening of the old conflicts and once again that can be laid squarely at the doors of Westminster
The British don't seem to have the slightest concept of the continuing effects of colonisation on the victims of that long dead means of dominating entire nations   
JIm Carroll