[SamReidHughes]

It's easy to form an argument based on justice and individual liberty. Allow entry to people with low chance of staying illegally. Visa waiver enhances liberty for people that meet that probability in a bureaucratically implementable way.

Also, let's suppose our immigration system limits permanent residence intake to N people per year. Because all people are equal, why is it any better to accept N people from all nations instead of N people from fewer nations? Either way you're still depriving the same number of people the ability to live here. Unless you think people from country X are more worthy than country Y, you should regard substituting a Y person with an X as a morally neutral act. It makes practical sense to invite people we like the most, which for example might mean people that are not interested in enslaving humanity or who associate with that crowd.