"only positive results" is simply not true, and a dangerous assertion if you want legalization in the US to not just happen, but to stick. In the Netherlands,

"only positive results" is simply not true, and a dangerous assertion if you want legalization in the US to not just happen, but to stick. In the Netherlands, we're still struggling with tons of unforeseen side-effects of partial legalization (like a excessive alcohol abuse amongst teenagers, since drugs are no longer particularly "cool", and alcohol is much cheaper and more available). The net result has been positive, but it's not without its problems. As a results, there is still a lot of pressure from conservatives to take more repressive measures, and the road to full legalization is blocked by the relations with other countries (not just immediate neighbors, but the entire EU with its wide-open borders and the US that meddles in everyone's business) that take a much less liberal view. Bottom line is: legalization will create new problems, some of them may be hard to predict. It does not magically solve the problem. It just allows you to focus efforts and resources on the real problems, instead of the side-effects of prohibition.