Liberty is an extremely important value. Unfortunately, most libertarians act like it's the only value that really counts. There's a lot more to life than liberty: Happiness, prosperity, equality, virtue, culture, common decency, and even survival. Sophisticated libertarians will naturally object that liberty is great for all of these other values, too. Often, they're right. But not always. Liberty and these other values sometimes conflict, and there's no reason why liberty should always prevail.
This post is the first half in Caplan's discussion of why Libertarians should be Conservatives/Why Conservatives should be Libertarians.
As a recovering Libertarian myself, I found this post excellent throughout.