Sauce for the goose is sauce for the gander. I am indifferent to the plight of former colonial nations experiencing the same phenomenon in reverse.

Migration is a policy issue, not some natural force like osmosis.

There's a whole discipline called social physics successfully leveraging models from physics, chemistry, and mathematics to analyze and predict social phenomena. Just as the behavior of flocking birds can be reliably modeled with a few differential equations, so can a great many social changes.

https://www.sciencedirect.com/science/article/abs/pii/S03701...