There are people who are turned away because they are afraid of the law, of being caught, but there are also lots of people for whom the law is more informative than threatening. If I see the speed limit drop from 80 to 25, maybe I slow down because I am afraid of a ticket but I probably slow down because I trust that there is some good reason for the lower limit. If a substance is made illegal I will be hesitant to use or purchase it because I have a degree in trust in my government. I trust that someone spent time looking at a substance and made a decision. Laws, even if never enforced, can still dissuade people.

On the other hand, if one never trusts government then every law is a problem, every ban an infringement upon liberty.