This is not just a simple house move, this is a whole on nation move, where you may never get to go back. There's will be massive paperwork, a lot of uncertainty, chaos and pain. From my anecdotal knowledge on what happened in countries like west/east germany, north/south korea, india/pak, I can say that this event will be very stressful for a lot of people.

Especially if you have to move for your safety. You might have to sell your house for cheaper than what it's worth, you might not be able to buy new land or find good renting opportunities. You might have to sell your business or close down. You might have to find new jobs, new schools, new everything. And some people just don't want to leave their home, no matter how fucked things are, because there's a chance they'll never see it again.

This isn't to mention, the pain that will come with such a divorce, the shame, and the lost hopes.

It's definitely hard and complex. I think you are greatly underestimating how traumatic such a move would be for a lot of people (even if it maybe necessary).