Many of the people who are fleeing to find a better life (whether it be prehistoric or modern) aren't doing it because of "romantic pastoralism", a lot of it is to flee from existing oppressive relationships and create new better ones (war, conflict, drought, abusive families). Don't you think that core tenet of freedom isn't worth pursuing?
The book is definitely not romanticizing nomadic life, it says that the movement of persons have been one of the defining aspects of human life (given a plethora of anthropological records) that we have gradually lost due to the rise of modern states, the tracking of individual citizens and their movements, and strict management of borders.
