It is not possible to own land in the absence of force, thus privatisation is only possible through government.
Invalid conclusion. It assumes that force used to defend occupied land, is always offensive, when it could be defensive.
You are conveniently ignoring the idea that people are physical beings and if a person occupies a place prior to another person, and another person comes along and tries to displace the original occupier the person seeking to displace is the aggressor. The aggressor is the one using offensive force.
In nature that is known as, "I was here first" and is a physical fact of nature, since no two physical things can occupy the same space at the same time can they?
If it were not true, when your little sister routinely boxed your ears and made you exit the prime shotgun seat in the family jalopy to the losers seat in the waaay back of the station wagon your sniveling plea to your mom, "I was here first", would have been a non sequitur instead of a whiny, but valid plea on your part.