I found this article by Lawrence Lessig, Why Your Broadband Sucks, to present a good perspective of the role of government and industry in providing general good.

Although this principle is true enough in most cases, it is obviously not true in all. The government should certainly not do what private enterprise can do better (e.g., make computers). And the government should not prohibit private enterprise from competing against it (e.g., FedEx). But the government also should not act as the cat's paw for one of the most powerful industries in the nation by making competition against that industry illegal, whether from government or not. This is true, at least, when it is unclear just what kind of "good" such competition might produce.