Free movement of people is a basic human right—the accident of where you're born shouldn't determine your opportunity to escape poverty or oppression. Wealthy nations have the resources to absorb and benefit from migration, and empirically migrants contribute economically and culturally. Restricting movement based on nationality is fundamentally unjust and perpetuates global inequality.
No nation can absorb unlimited migration without serious consequences for its own citizens—wage pressure on lower-income workers, strain on public services, and social cohesion challenges are real costs. A country has the right to control who lives within its borders and maintain the social contract with its existing citizens. Sustainable immigration requires limits, integration capacity, and democratic input.