Simple. Capitalism. In nature, birds own their nests, beaver own their lodges in the ponds they created with their dams, etc.. In primitive societies, the villagers own the huts they have built, like in the natural world. In order for a slave or Feudal or plantation system to exist, external force or a government must be there to impose it. Socialism is anti nature and anti human and an artificial construct. Socialism is based on lies.