Both culturally and politically, libertarianism is on the rise.
At its simplest, it is a philosophy that asserts the simple principle that we are all free to live our lives as we please inasmuch as we do not limit the freedom of others to do the same. It recognizes that we all have different backgrounds, desires and ambitions, and different metrics and systems for judging the behaviors and choices of ourselves and others.
Since it rests on the notion that one human being cannot know what is best for another - or at least cannot know it better than the other person, himself - it is an essentially humble philosophy in disposition and an essentially tolerant philosophy in prescription. Indeed, tolerance, manifest as lack of aggression, is just about its only hard-and-fast prescription.