I disagree with the premise of this post.

A person needs to set boundaries. If they do not, they get walked all over by friends and foes alike. They need to set emotional boundaries, and they need to set physical boundaries.

Property rights are well recognized as essential to a society. However, we also need to recognize what is property.
You have a solid fence around your 4 acre farm, you are well within your rights to defend it from all invaders.
You have a few "no trespassing signs" around your 10,000 acre wooded, undeveloped mountain. You don't really have anything showing ownership, nor do you have the means to defend it.

So, borders are essential to the human and to the human groups. And they need to be defended. Letting someone(s) walk all over you is not good.

Our current idea of borders is that we want to claim all the land around us so that others do not claim the land. Most of the land on The U.S./Canadian border has no one there. It doesn't belong to anyone. However, long ago some governments got together and agreed this is our mutually exclusive edge.

So, our problem really is with what we call a border. We need to claim the land we are actually using and defend it. That is our borders. What the govern-cement calls borders isn't really a border. It exists no where but on maps.

When people get to the point of stopping the land grab (I need to grab it all before my neighbor grabs it) and start working on the piece of land that they are able to control, manage, and use then maybe we will actually see an answer to this question.