The basic problem with illegal immigrants from a libertarian standpoint as they are in constant need of public services far and away above the average citizen while contributing very little in the form of taxation due to being so low skilled. The consequences for this is that citizens are entered into mandatory contracts with them through taxation for social services. Libertarians are supposed to be against nonvoluntary contracts. Many libertarians have somehow been suckered into supporting policies that make them less and less free. It reminds me of people who call themselves stateless communists, but always vote in a way that makes the state larger and more controlling.