And it isn't random. You can acquire this property if you want. But be aware, you seem to be expecting to acquire the "entire society's wealth"...most of this land isn't that valuable and that land that is requires work (which is why it is valuable).
Again, I don't understand what your point is here beyond anger that someone else has something you want?
EDIT: Are you actually familiar with the population distribution and density in Scotland? A good chunk of this land is just agriculture and rough grass that has few economic uses. This isn't land that anyone wants to live on. The main concern of the govt, as I understand it, is to encourage forestry (which will mean more large owners, not less).