A lot of ink has been spilled in recent days about the Senate’s $118 billion border bill, most of it detailing just how awful the proposed legislation is — awful, that is, if your goal is actually to secure the border. The bill creates a new baseline of admitting 1.8 million illegal immigrants annually, doles out work permits and green cards on the whim of federal bureaucrats, and funnels billions of tax dollars to the same NGOs that have for years facilitated mass illegal border crossings. And that’s just for starters. But not much has been said about Mexico’s role...