The Role of Government First and foremost to provide for national defense and domestic security. After that, it becomes a trade-off between economy of scale, e.g. providing for an interstate transportation system, educational school system, etc. and the enormous wasteage, corruption and theft of a government bureaucracy. There is no such thing as a benevolent government working on behalf of the people.
As for security and national defense the is always the high probability of such an apparatus turning on the people and assume control for its own economic benefits.