For sure, some Brexiters were ignorant of Ireland’s independence, or thought it unreal, at least until the Joint Report in December 2017 demonstrated that the EU would place Ireland’s interests in the top three issues to be negotiated in the UK’s withdrawal. /2
Other Brexiters acknowledged Ireland’s independence but assumed, deeply foolishly, that it would follow the UK out of the EU, and perhaps join a UK-led customs union. /3
None of this has come to pass. But the graphic suggests it has. Brexit has not in fact caused fractures to Irish politics on anything remotely like the scale of what has happened, and continues to happen, in the UK. /end.