I own a little piece of the planet for as long as I am alive, and it is socially acceptable for me to kill anyone who comes on said land against my will.
What if the government authorities ask you to vacate your land, with or without adequate compensation? My family lost almost 600 acres of land six decades ago, when the local communist government implemented the land reforms act. They took land from the big land-holders and distributed it to the landless peasants. And we received no compensation for the land we lost. What can we do? If we go to the court, the legal battle will wage on for many decades and the chances are that we will never win it.
That is a really sad story... People think who have vast lands conquered it only by abusing others, but it may not be true. Many people conquered their wealthy and became rich by working hard and being smart enough to save money and invest it on the right opportunities. And then, a communist (that have never built anything on his life) comes and take everything from this person. In this case there isn't "historical debt".
To prevent this to happen the communists disarm the population, so they nuke any resistance possibility, and once it's done and everyone gives in their weapons, you can't shoot who enters your lands against your will.
More than taking care of the nature, our cities, houses and planet, we need to take care our individual liberties aren't restrained!