I'm replying to your post below, as I can't reply to it directly:

That patch of land is the mine, the same way that the fish is mine, or my words are mine. We take the same principles in how we understand those to be my property and apply them to the land that I own as well.

As far as the example above, could a two year old say "mine" and kill people who dispute it? I suppose so, but what kinda world do you think we live in? This stuff is extremely rare, most people don't act that way and understand property implicitly with all of the actions they take on a day to day basis. Violence is very rarely ever needed to defend property or claim property (unless you're a government) ^^