Scott Morgan spells it out:

We're going to legalize pot, not thuggery. The murderers in Mexico don't possess a single skill that would give them an advantage in a regulated market. Their only asset is a willingness to break the law, and in the unlikely event that they elected to run a legal business instead, they wouldn't be criminals anymore. We will control the regulatory process and there's nothing about marijuana that invites fraud or extortion to any greater extent than every other taxable commodity on the market.