How about the benefit of Fascist cities falling civil disorder only when the unhappy civilians outnumber the happy civilians by two (from one)? It would fit in with the definition of the suppresion of the opposition.Fascism
1. A system of government marked by centralization of authority under a dictator, stringent socioeconomic controls, suppression of the opposition through terror and censorship, and typically a policy of belligerent nationalism and racism.
Of course, to prevent it from being too overpowered, it could be made so that only a maximum of 5 cities will be able to benefit from this. Any more and the citizens will become too incensed to be suppressed.