I don’t dispute this fact. The owner of the land and families should be willing to make a deal. No reason for greed to play a part.
Actually, the families are not a party in the acquisition. This deals with the Federal Government acquiring land for a National Monument.
Now that the point has been made, maybe both the National Park Service and the land owners can sit down and work out a fair deal where the Park Service does not try to cheat the owners because they can resort to eminent domain and the owners do not try to gouge the Park Service because they believe that they can hold out for top dollar because the Park Service can't pass up on the land.