There is a difference between liberal and libertarian. Libertarianism has a fairly narrow support even in the US. Those who argue for less regulation also want to ban abortion. The most libertarian representation in US politics was Greenspan and he seemed to walk back on it in 2008. It's a niche point of view in the United states.

Moreover, if libertarianism has value, it should be defensible without appeal to the support or lack of support in popular culture.