Government exists for one and only one purpose: to perform or manage tasks that must be performed monopolistically.
Competition is necessary for maximizing skill, so government should perform, or manage, only tasks that must be performed monopolistically. Other tasks should be left to the private sector, where they will benefit from the incentives of competition.
To illustrate this idea, I considered the following examples: the Kennedy assassination, the TSA, public schools, a minimum wage, the healthcare and health-insurance markets, regulating the money supply, a price ceiling on government, minimizing government, and direct democracy vs. representative democracy.
Reference citation. Philip Bitar, adapted from Why Human Life Makes Sense, Edition 3, 2015, p. 360, posted at www.WhyHumanLifeMakesSense.com, 2015-03-18.