The unreasonable part is the US setting up a system that makes immigration illegal but encourages it so that farmers can have a cheap supply of exploitable labor then deporting said immigrants so politicians can use fear of "the other" to manipulate voters and appeal to bigots. Farm workers use to come to the US for the harvest, get paid, and go home. Now getting here is so much work it's only worth it if you stay longer then one season.

And that's ignoring the fact that the political and economic uncertainty that drives people to immigrate here in the first place is constantly the result of actions made by the US.

Not that I believe in any of that. Borders exist to limit the power of states, not the movement of people.