Terrain. About 50% of the California / Mexico border is almost impassable by foot. How would you get he people and equipment down in those canyons to build a wall. And believe me, they will destroy that wall if it is not guarded 24/7.
I'm not recommending that the border patrol or the military join hands and form a human chain at the top of the walls. With electronic surveillance, it's not going to take 200,000 troops to stop women pole-vaulters that are 9 months pregnant.
We have millions of sensors along the border now, but not the man power to respond to them all. Pregnant women make up a very very small majority of the illegals that cross from Mexico.
I'm all for fining and jailing anyone that employs illegal aliens, but how does that stop the terrorists, the Red Mafia, the Yakuza and agents of adversary foreign governments?
So far there is no evidence that terrorists, the Red Mafia, the Yakuza and agents of adversary foreign governments have crossed the border through Mexico. While it is possible that these folks can cross the border from Mexico, it is more likely that they will just get a real or counterfeit visa and enter the country at a port of entry.
Mexico has the natural resources to develope it's own economy.
True, but they do not know how to properly exploit them. We would be better off spending our money getting them out of the third world and into our world. Mexico accounts for over 60% of all illegal traffic across the southern border. If we get them going and they stop coming here, then we only have to deal with the remaining 40%.
While not the perfect solution, a wall would work. Walls and fences have worked to secure perimeters since man has walked the earth. Take a look at any auto plant. It has a fenced perimeter with a few guards monitoring television cameras. If General Motors thought it was cheaper to surround their plants with guards than with fences, they would do it.
I read that the costs to install 400 baggage scanners in the nation's airports will cost the airports $40 billion, not the $4 billion originally estimated. For that kind of money, we could build the greatest security walls in history on BOTH the north and south borders of the United States.
The object of building walls is to keep Illegals, terrorists, other criminals, drugs smugglers, etc. from crossing the border and getting to L.A., Dallas, Phoenix, Chicago, Detroit, New York, etc., not out of the canyon. We're not building a wall for the sake of building a wall, for Pete's sake. ;^)
If the natural terrain makes it impassable enough by illegals, etc. then we don't need to build a wall, there.
Sounds like the cost of building walls along our borders just got alot CHEAPER!