A civil war? He hadn't considered that, and he frowns deeply in thought. Could be. As far as they know there's no one else on the planet except the people in Anchor. However ...

"If some wanted to leave and others did not, I fail to see why that would be a problem. Why force people to leave or stay?"

If someone figured out a way to leave, then surely the people who wanted to would be allowed to do so. And if not, why?