Geography definitely has a lot to do with it, as well as history.  I would call myself center-left within the Canadian spectrum, strongly pro-democracy, which apparently makes me a Bernie Sanders-type "extremist" by the standards of the US media.

But I find Vance's politics to be all over the map.  Certainly Wyst is a deliberate parody of a socialist egalitarian state as a conservative twentieth-century American might perceive it.  But Jack's lack of respect for organized religion doesn't square with the current, middle-of-the-bell-curve American conservative, who disses evolution and believes the 97 per cent of climate scientists are engaged in a world-wide conspiracy.

And how does a libertarian square his convictions with the positive portrayal of the Connatic, an unelected autocrat who tramples over the rights of his subjects at his sole discretion?   And how to square the "I am the law" ethic of the Connatic with the pure vigilantism of The Demon Princes novels?

Again, with the exception of Wyst, I am not aware of Jack Vance as a polemicist.  He is primarily a tale-teller of the old school, and the societies he postulates represent all kinds of political and social possibilities.  His own views on them are open to speculation.