They believe they represent the mainstream, that most Americans are libertarians who just don't know it yet. Libertarians believe the most in human goodness. Libertarians believe that humans are so good that they don't need to be controlled by a government. We believe the laws designed to compel people to be good are unnecessary. The common people with their common wisdom will handle their own affairs far better than any law could dictate that they must.
Libertarians believe the least in human goodness.
Libertarians believe that people are too evil to be trusted with the power of government. We believe that people will oppress each other without mercy if the tools are in their hands. Even the wisest and kindest among us will do more harm than good by using the violent power of the state. Libertarians are sure to fail. The media and the educational system have convinced the people that a strong government is good, or at least necessary.