Son of the Tree is essentially political. There is also a statement of the theme of Koryphon in, I think, House on Lily Street, i.e. that all ownership can be traced to a prior act of violence.

My formative years were the 1950s, reading science fiction which, at that time, had similar values to Westerns. The idea of the "competent man" has been mentioned before. Taken to its extreme, this becomes "Atlas Shrugged", a place Vance never went!