TexasCHLforum.com

The Mexican government can't afford to guard their northern border. They're too busy trying to keep Guatemalans and Hondurans and Panamanians from sneaking north to work illegally in Mexican fields and clothing factories.

To the degree that they guard the northern border at all, it's mostly to ensure free passage for people and "goods" heading north; they aren't concerned with anything heading south, so long as they get a bite.

Personally, I would welcome a wide-open border for guest workers. This would make it easy to track who comes in, since they could just drive through the legal border crossings, instead of sneaking across country through the desert. At the same time, I fume at Mexico's double standard for immigration, which is not unlike their double standard for human rights, civil rights, and prison conditions. Ideally, crossing the Rio Grande would be no different than crossing the Red or the Sabine; citizens on both sides could live where they prefer, but shop and work elsewhere if it suited them.