Before the Hope left Earth, according to the discussion between Yao Yuan and his men, half of the population they rescued would be from Country Z and the other half from the rest of the world.
This decision had already created a great psychological pressure on many westerners. For example, many European scientists were worried Yao Yuan would use Country Z’s administrative pattern to govern them after they got on the Hope. However, since the Hope was their last saving straw, they had to submit to such a treatment even if Yao Yuan did decide to do so.