Firstly, "persecute" is a strong word for simply not letting people into our countries, and we're absolutely entitled to do that anyway.

Secondly, some people simply are second-class citizens. People flying "economy" are not treated the same as those in first-class - because they are literally second-class travelers. Similarly, the interests of the native people come first, with the interests of those with less of a stake in the country coming, yes, second.

Second-class doesn't mean we treat people horribly, or that we are mean or violent toward them. It does mean that we weight their interests lower, just like we provide the best food to the first-class passengers on a flight.

(I should also note that it's white people who are treated as second-class citizens in our own countries as it stands; so even the classical liberals are on our side in fighting anti-whiteism.)