Some of us would like our children to be able to live in the place they are growing up. And we value what newcomers and immigrants bring to the table in terms of hard work, new ideas, energy, and so on.

Also, one of the easiest ways to make people better off is to let them move to where the jobs are. That used to be very common in the United States. That has been stunted in some part by rigid land use laws that pull up the ladder behind the people who got in while the getting was good.

There is a lot of work in economics showing the benefits of clustering, rather than having a talented up and coming person move to, say, Cyanide Springs Oklahoma because it's cheap.