We don't talk about the Mexican side of this border wall issue very much, but that's a good point. When we shut off the flow of illegals coming north, we shut off their corrupt government's safety valve that keeps them from 1. having to support them, driving the Mexican government to insolvency, and 2. massive civil unrest. Just think if there were still those 20 million (or whatever the number is) dirt poor, uneducated Mexicans living in Mexico. That's one out of every six or seven Mexicans alive today living in the US. They would have had a revolution decades ago.