For those unfamiliar, Williams is often the left’s advocate on Fox News. He’s had a long career supporting leftist thoughts and ideas.
I don’t have anything against the guy, and, from what I can tell, he’s genuine. He believes in most of what he babbles.
As to him being a “libertarian”, well, that’s the Libertarian’s fault. They seem to thrive on being ambiguously defined. But, if Williams is a libertarian, then, anyone can be one. It’s as definitive as saying I’m a life-form.