I had a similar experience as a kid at Dairy Queen. At the time, I adhered to the common cultural milieu in my little Bible belt town and had a load of cognitive dissonance when they took my friends away, never to be seen again -- the spirit of this was totally violated: "For I was hungry and you gave me something to eat, I was thirsty and you gave me something to drink, I was a stranger and you invited me in, I needed clothes and you clothed me, I was sick and you looked after me, I was in prison and you came to visit me."
It was an eye opening experience for me. I take as a fundamental human right that people and capital should be able to travel without sovereign restraint. You should be able to vote with your feet.
I get the pro-isolationist arguments regarding wages, of course, but restricting immigration because your wages are at risk is a zero-sum game where one side the winner violates a human right.
The EU gets this and allows people to travel to work between countries. The US gets this and allows people to travel to work between states. Why does a line on the ground invoke magical worldviews and forced tribalism supporting sovereignty?