Border enforcement represents an unparalleled assault on the free market.
According to Gallup some 750 million people would move to the US. The average income of a 1st generation immigrant is ~45k. That is a whopping ~30 trillion dollars of market suppression every year. That's almost twice our GDP worth of market suppression.
There is simply no other government program that suppresses the free market to that degree. There is simply no other government program that suppresses the freedom of individuals to that degree.
Now, personally, I like borders. But I also profoundly distrust the free market in certain fields. If you claim to trust free markets, you either hate borders or are a hypocrite. Period.
In a perfect world there would be no borders. Government would only exist to take care of the things that guide us and support us but not control us. Individuals would earn their own way or starve.
The problem with this is that Americans, like myself and my family, can't compete when people who live in mud huts steal our jobs and make us obsolete. We can't have an American lifestyle if we have to compete with Chinese low skill slave labor. We aren't fighting for the planet. We are fighting for our team. Team America. A better world for Americans as it currently exists, not in some dream utopia. And for that we need to install controls. Controls that limit the supply of labor so that wages stay high enough to live a decent life. Controls that insure imports from poorer countries doesn't bankrupt companies who makes things while paying an American living wage. Otherwise I'll be living in a mud hut.
American ancestors worked hard to provide for their children to live bigger better lives. It isn't fair to ruin that by introducing the rest of the world into a world wide marketplace watering down our gains. They are destitute because as a society they weren't as successful as we were. But our success is temporary. It is a losing battle to maintain the status quo. Nevertheless It's a battle I and we should fight every day to insure every American has the ability to live an American lifestyle regardless as to how the rest of the world lives. You think the housing bubble was big, wait until you see the civilization bubble pop and the whole world turns into one marketplace with it's poor parts sucking the rich parts dry. We will eventually lose our battle at being special. But hopefully that will happen after I have died.