emergent norm theory
The theory hypothesizes that non-traditional behavior develops in crowds as a result of the emergence of
new behavioral norms in response to a precipitating crisis.New conventions must form as part of the collective action.
The excerpt provides an example of the regulating zoning responsibility of the local government. This can be proven with the definition of zoning which is; divide into or assign to zones, in particular. When compared to the example provided the definition seems to fit.
Because he sees Japanese as disease from the outside but the communist is a disease from the inside and need to destroy before becoming an unstoppable force. Also the communist is a blocking of his plan to unify China in one flag to defeat the Japanese forces in the country.