Except that you can point to deaths, loss of productively, loss of revenue, etc caused by racist attitudes. And you can point to benefits caused by immigration.

I still have yet to hear an answer from my initial question about why any of this is a genuine problem aside from housing which I agree with but disagree on the solution.

To make progress concrete things need to exist for discussion around them to happen.

Deaths is an odd one to pick considering racial homicide statistics, so there's another problem for you to chew on.

I think the real fundamental problem we're running into is that we don't have a shared set of moral axioms. You've probably chosen international/interracial cooperation as one and I have not.