What's wrong with them having preference for people of a similar race? What's wrong for looking at the source countries of many of these immigrants and saying no thanks? No one's in a hurry to make sure lots of whites have positions in Mexico or China.
Well history suggests some answers to that question, even ignoring the ethical dimensions. If you choose to ignore almost all of those answers and the ethics in favor of purely selfish arguments, then realize that eventually people who look like you will be on the losing side of this equation.
Japan has a low birthrate but doesn't accept losing their ethnic makeup is a good solution.
Ok, but they don’t have a solution, period. When they figure out one that works, you might have a point?