If, like i said, social isolation is necessary to maintain ideological isolation, then here’s an extra irony to consumer culture: as The Market spreads across the world promoting Democracy and Freedom, it also extends the kind of atomisation that allows people to live in different social worlds than their neighbours and hence allows more ideological extremism.
Ideological divergence because of more social isolation vs ideological homongenisation because of an increasingly similar macro-economic condition (ie consumer society).
How the two forces will play out beats me