I'm assuming this is your interpretation of their position, and not a statement of belief. Because as always, the libertarian position is wildly at odds with reality and history, and grossly over-estimates the impacts of the factors it can control, while grossly underestimating the impact of the problematic ones (to take an example from the above: it presumes that the cost of murder-for-hire is high in the places drugs are made. It has no answer beyond falling back of ideologically not caring if it turns out to be a sound business strategy).