Here’s a little something to blow your mind.
Actually, Prohibition Was a Success
http://www.nytimes.com/1989/10/16/opinion/actually-prohibition-was-a-success.html
You should actually read it. It actually shows why you’re wrong. The “best” prohibition did was reduce use, and it made a massive black market. And his conclusions have serious issues. Most historians attest the reduction in use to the PR from the temperance movement which made prohibition, not prohibition itself. A similar cycle can be seen in drunk driving, the laws haven’t effected people’s behavior nearly as much as the societal change that lead to the laws.
This article, which unlike yours cites actual sources, says otherwise: http://object.cato.org/sites/cato.org/files/pubs/pdf/pa157.pdf