Anyone can invent a utopia with a pre-existing utopia watching over it. Smith had other conditions under which this delicate ideal capitalism would work, such as transparent availability of information and limits on one party's ability to dominate a market, but the main one was that self-interest would stop at the invisible boundary between minding one's private business and the desire to coerce the state. Once self-interest is unleashed, it turns out 242 years later, those boundaries that don't serve the self-interest of capitalists have all but dissolved.