Be warned some large speculation follows

There is a fairly strong liberal/conservative split between urban and rural areas. Now let us say that the human brain is slightly polymorphic and alters its structure dependent upon the population density it finds itself in.

In an urban environment the brain needs to worry somewhat about non-human threats, disease and fire. Raiding from bandits is less of a problem. Some form of taking of money (be it a protection racket or legitimate government) is very likely and in this situation it is unlikely to be able to be resisted successfully.

If a brain finds itself in sparse population, it might be able resist taxes if all its neighbors do and strange human actors such as bandits/raiders are more of threat.