I find it hard to see reunification as other than a good thing, really (and a belated victory for my late, Irish, pre-partition-IRA-supporting great-grandmother!)
I find it intriguing what both Trump and Brexit say about the divisions within the ruling classes. The clear divergence between the Kochs and Trump, for example.
There are clearly two different factions of the affluent elite there. Those who helped design an international system to protect elite American interests, and those who now see that system as part of the problem, and something to reject and dismantle. It's hard not to see the latter as just irrational, but maybe the effects of 'culture' are often hard to distinguish from madness?
It was, after all, the same right-wing newspapers who campaigned for Brexit who supported a pro-EEC vote in the previous referendum. The Tories took us in and then they wanted us out. Just as the US elites designed the post-war global trade system and now some of them have decided they want to smash it up. I find this confusing.