Occasionally I'll run across crackpot (and always leftist) "libertarians" who claim, "I don't see any borders" when they babble their dangerous and destructive nonsense about open borders.
Guess what - I don't see any property lines, either.
Now of course these leftists do believe in property - their property. And they certainly don't want a family of Africans or Muslims moving into their front yard and camping there permanently. Or moving into their houses.
These people are utter hypocrites. Self-deluded hypocrites.
They also believe (whether they know it or not) that there are no differences between races, ethnic groups and religions - that Africans are equal to Europeans or Islam is equal to Christianity. So it's okay if they move here en masse (they seem to think these people will be good for the economy and the culture - har! har!)
They also hate Christianity and tend to be part of the "I Fucking Love Science" crowd. That proves they know nothing about Christianity or science. Those two particular obsessions have also been part of leftism for hundreds of years. Not that they know it, being uneducated.
The West was founded on Christianity. Without it, no West. For that matter, science was founded on Christianity, although they are clueless about that and believe the exact opposite.
Erik von Kuehnelt-Leddihn makes the argument - and it's a persuasive one - that leftism was founded by the Marquis de Sade, a fanatical atheist and complete nihilist who considered people no better than insects.
About the only leftist people know is Karl Marx. But in-between de Sade and Marx there were two other very influential nuts. One was Henri Saint-Simon, and after him, Charles Fourier.
Fourier was particularly unbalanced, far more than Saint-Simon. He wrote hundreds of pages of detailed fantasies about how people can be re-engineered and moved around like checkers to create the New Man and the New Society (this is something all leftists believe).
People founded several communes based on the ideas of Fourier, including in America (they all failed), which I find odd, since de Sade, Saint-Simon and Fourier were French, and Marx, German. This country was founded on getting away from Europe, and now people were importing its crackpot ideas over here.
If we did have completely open borders we would have the New Man and New Society - New Primitive Man and the New Primitive Society. That's what comes of thinking someone can re-engineer people for their own good - and the road to Hell is paved with good intentions.
Leftists always hate and envy and want to destroy. It's in their nature.
What leftism leads to is easy to predict. But to not know these things - well, you have to be a leftist. Who, again, are completely deluded.