The idea of a united Ireland is not crazy in itself, so I will respond to that one. It may well be that in the longer term that is the solution. But it would not do to underestimate the difficulties of getting there. To begin with, there was plenty of loyalist violence before, so there would be a significant risk to that breaking out again. Nor would it be just an EU problem. Loyalist bombs on the UK mainland would not be unthinkable.

Then there is the politics. May would not want to go done in history as the PM who dismantled the Union, (especially as head of the Conservative and Unionist party, remember). It would also incentivise Scottish independence. Jacob Rees Mogg has said Now Then Ireland is just as much part of the UK as Somerset, so he is not likely to be keen on your idea either.

Then Joe Public may not think about NI from one day to the next, but has a strong emotional attachment to "The United Kingdom': it is part of their fundamental identity.

Next add in all the international implications. To take a trivial cases I need to apply for some visas shortly. The rules those other countries have set talk about the UK. At the least, it will take some time for them to get around to changing that to individual countries, or what other revisions might be needed.

All in all, it sounds like the whole Brexit approach to me: let's go for something without thinking about the possibl3 consequences. It may be we believe the pain is worth it. All well and good, but let's have thought out the pain first before we a t.