Harry C. Barbusse is Cover's idea of a libertarian hero, since he's a self-created, independent entrepreneur. Unfortunately, Barbusse is also a mass murderer. Cover is not subtle. Perhaps he should be a privateer, who will steal from merchant ships to force people to be free. Barnes's story is the best in the book, because he forces his readers to check their premises.
Barnes also shows liberty-minded sf writers the right way to proceed if they want to advance.
Libertarian science fiction often fails because of its predictability. Too often, libertarian writers consider their politics more important than their art, resulting in cartoonish morality plays where the bureaucrats are always wrong and the capitalist heroes always win. Moreover, many libertarian sf writers stop their plots for long speeches on the virtues of the free market and the wickedness of the state. If libertarians continue to produce such didactic and predictable works, they will become marginalized. And their failures will not be the work of nasty liberal sf editors in New York, but their inability to please the vast majority of sf readers, who choose what to buy based on an author's story-telling ability and not on his politics.