I am often accused of being an idealist. Unable to deal with the 'real world,' they say, I adhere to an ideology that has no practical application. There is no constituency to abolish the FDA, SSA, CIA, IRS, or DEA. Also, a libertarian society would provide no safety net and people could starve, or be homeless, or die without all these government programs. Imposing the libertarian system on a modern society would require everyone to accept it, and that ain't going to happen. Idealism never works, they say, which is why all 'isms' fail. Libertarianism is no different from Communism. Pie in the sky, impractical, doomed to failure.
Perhaps the critique of Communism is correct. It does seem to require a violent revolution to wipe away the old bourgeois regime and replace it with a worker's paradise in one fell swoop. If the program is not adopted in its' entirety, it fails. Let one bourgeois remain in power and he will ruin the Communist stew. Root them out! Kill them all! Purge society of the wreckers so Communism can flourish and create a worker's paradise. So when critics of Communism say it doesn't work, and Communists reply that it hasn't been tried, the Communists have a point. (Forget for a moment that successful small scale communist experiments have been carried out in the U.S. since the early 1800's, in towns such as New Harmony and New Economy.) Both the critics of Communism and the supporters of Communism agree: what has been tried in various nations around the world has lacked the requisite purity, and they have all failed miserably. Maybe it would work if pure, but we know it won't work if it is impure.
While Libertarianism tries to be a comprehensive political philosophy, like the Marxist and Communist theories, it does not run afoul of the same purity problem as other 'isms.' Impure libertarian societies have existed on a national scale, and they have been highly successful. I'm thinking of the U.S. prior to World War I. The Roman Republic before Caesar crossed the Rubicon. Hong Kong. Even the ancient Hebrews lived in a kind of libertarian world with no kings or rulers (the Jews were warned not to get a king because he would tax their wealth and send their children off to war...oh how prophetic!) In each case, the relative freedom enjoyed by individuals in those societies resulted in stable and wealthy communities. As their freedoms were curtailed, each of those societies experienced a decline in wealth, stability, and vitality (Hong Kong has not yet seen a decline, as it remains one of the freest places on earth despite belonging to a 'communist' country). Libertarian theory endorses the idea that more freedom means more wealth, stability, and security, while less freedom means more poverty, discontent, and conflict.
Taken to its' logical extreme, Libertarianism calls for an entirely voluntary society. A century and a half ago, that might have been imaginable. Today, from the perspective of people who are taxed, licensed, mandated, regulated, and subsidized by a 360 degree government that alternates between kind paternalism and nasty scold, this is a ridiculous thought. Surely the Libertarian ideal is so disconnected with the world as it exists that it is not worthy of serious consideration. Problems today must be fixed with practical solutions, not pie-in-the-sky theories.
Actually, this is where Libertarianism excels. Since Libertarianism does not require perfect execution to generate positive results, it can be taken in small pieces. Example: When the airlines were "deregulated" in the late 1970's and early 1980's, there was loud complaining that air travel would become more expensive and unsafe. Libertarian theory said it would become more affordable, flexible, and safer (if that was important to consumers). Indeed, that is exactly what happened. Air travel boomed. Over the next ten years fares dropped by some 50% and the number of carriers and routes doubled, making air travel affordable and practical for millions of Americans who otherwise would not have considered flying. The entire economy did not have to be deregulated, just a portion of a portion. More freedom was better, however limited.
The same thing happened with the trucking business at about the same time. The result was lower freight rates for industry and lower merchandise prices for consumers.
Alcohol prohibition in the 1920's resulted in a wave of violent crime as gangs battled over the black market while doing little to decrease drinking. Making alcohol legal again was another step in the direction of freedom, and the unintended consequences of prohibition disappeared overnight. A similar approach is needed with marijuana, and for the same reasons: it is practical and it is the right thing to do in a free society. Theory says that society would benefit from legalizing all drugs, but it will benefit from just the first small step with marijuana.
Libertarianism is not all or nothing. In general, freedom is good, more freedom is better. It is not necessary to have a pure Libertarian system to experience the benefits of freedom. Libertarian theory can be taken to the extreme...if you want...but it can also be taken is small pieces if that is all your society can handle. No need for a violent revolution. Just the steady drip, drip, drip of ideals and practical compromise. Then, one day, we may all be free. Perfectly free.
And it will seem perfectly reasonable.