Colorado's pot experiment is having disastrous results. No surprise. We conservatives told you so. A cautionary tale for other states.
Libertarians falsely assume that we are all rational agents who know their own long-term best interest and are willing and able to act upon that knowledge.
Anyone with any experience of the world and the people in it knows that the characteristic libertarian assumption is manifestly false.
More trenchant critiques of libertarian folly here.