Hmmmm, perhaps sufficiently ruthless Libertarians should support unfettered immigration.
Immigration is a huge, huge mess. Here, public institutions — libraries, schools, etc. — are being duplicated by a parallel set of private institutions. Private libraries. Private security. Private schools. Gated communities with private roads. The list of once-public-now-private is endless. Replacing public with private is, essentially, the only recourse people have when their collective will is ignored. Because of uncontrolled immigration, citizens vote with their feet, leaving public institutions. And with their pocketbooks. It won’t be long when citizens “defund” so-called “public” institutions, and in doing so, diminish the reach of government.
People vote for state provided services because for many people the State can provide the services better than the free market. Redistributionism often has little to do with it. (For example, the wealthy need a good road system as much or more than the poor do.) If the illegal immigration of large numbers of low skill workers into the country cripples the ability of the State to provide services, the political support for the welfare state will collapse. By giving it more clients than it can ever possibly handle, this state of affairs would kill the welfare state by choking it to death with cream.
Of course, this could lead to a situation where we basically import the 3rd world into America with the “haves” living in compounds surrounded by a sea of shanty towns.
I consider this a sub-optimum solution to say the least.