An added measure, sure. But very expensive, not very effective, and comes with collateral damage such as flooding. Is this really the best use of our taxpayer money? Can we get the same security benefits, for much less money, and with no collateral, environmental damage? Yes. So why do we need the wall? The wall is a false sense of security. The costs and damage far outweigh the minimal benefits. And plenty of evidence shows this. Any evidence a wall is the most cost effective way of securing our border?