Countries could also decide not to give immigrants the right to government assistance, or not until after a minimum number of years, or not until they’ve paid, say, $50,000 in taxes. And you could set up similar parameters if you’re concerned they form a political threat or won’t integrate. You can create language and culture tests. You can withhold the right to vote. And you can send them back if they don’t find a job. Unfair? Perhaps so. Yet isn’t the alternative of keeping people out altogether exponentially more unfair?