The United States and Mexico face a powerful onslaught of criminal activity damaging both countries. They need to step up cooperation now. U.S. threats are counterproductive. What if Mexico threatened a 25 percent tariff on American corn and soybeans unless U.S. citizens stopped providing the estimated $19-29 billion in drug sale profits each year to Mexican criminal groups? Or, what if Mexico threatened to impose tariffs on American pork until the United States stops the illegal flow of automatic weapons and ammunition across the shared border?