Actually, if you place your mailbox on the perimeter of the property - as is quite common in some areas - the mailman won’t enter your property.

Huh. Turns out you do have control over your property, after all.

That is not supportive of the "it's mine therefore I'm right" argument it's just a solution to this particular problem. We can go on like this all day, but the argument is, just because it's yours does not mean you can do whatever you want with it. I am trying to show the error of the thinking with more erroneous thinking.

“You can’t force me to use my property the way you see fit” != “it’s mine so I can do anything I want with it.”