The role of government defined by deep thinkers trying to sort through this mess is "authority with the monopoly of violence." The idea is no matter what ideology a gov has the never ending role of a government is to secure peace and stability by being the sole entity that can kill.

There are supposed to be checks and balances on this but historically when you introduce industry and money/rights to property, greed slowly takes over. The result is two extreme ideologies emerge, fascism or utopianism. One where wealth is concentrated with violence often by stealing and expands endlessly, the other where wealth is spread equally but runs into the moral problems associated with resource scarcity. Both systems end up as authoritarian and require revolutions to break.