Well to do Americans can just fly in. No fence can stop them. Lots of business transactions in Mexico with relocated American companies. It's not just Mexico, it is the over 160 countries coming in to create irregular warfare on Americans, can see it going on today from the drugs that kill a life not worth living on the streets, murder rate up in most areas where the initiation for gang membership is in place, child sex trafficking and no one knows where the "unaccompained children are at, yet when they do a sex trafficking ring bust they find young people, children, living with their aunt and uncles, lots of uncles from over the border. Cartel branch offices is what I like to call them. And the worse part the innocent that are coming over the border for all their free sht that the demoncrats hand them, free housing, free food, free medical, free electric, free education in public schools which requires more hires to take them from class to class because of the language barriers and all at the courtesy of tax money. Many of them once here have to work for the Cartels to pay off the debt owed to the Cartel for the trip to the border. Worse, because they were lied to, the free ride will end at the rate of decay in the US this day.
Build the wall, once going over the wall a person has clearly breached the no go zone, no excuses about where the border begins and will slow the free ride seekers down and the Cartel hires. Known criminals not allowed in the US don't go through border stations unless they are trying to use a fake identity like "family" with someones children. But good news the wall hoppers will be located in real time and removed to another location, the wall is more than "a wall" Ron Paul should know this.