Penn Jillette has written and spoken about why he was a libertarian in the past. I came across this quote in an interview on Cracked about his attitude to libertarianism has changed recently.

Many times when I identified as Libertarian, people said to me, “It’s just rich white guys that don’t want to be told what to do,” and I had a zillion answers to that — and now that seems 100 percent accurate.

Penn Jillette Wants to Talk It All Out (Tim Grierson/Cracked)

I came across this quote on a post from Jason Kottke's site.

Especially since most minimalists want to keep exactly the economic and police system that keeps them privileged. That’s libertarians for you - anarchists who want police protection from their slaves.

Green Mars (Kim Stanley Robinson)