We NEED the wall. This could have been 700 Al-qaeda insurgents and all the back packs could have been bombs, chem warfare, or dirty bombs. This goes to show. Hell with flying into New York. Fly into Mexico and walk across with no custom checks or no fly lists.
I saw a video of an automated paintball turret. Rig them up for high capacity, fill them with pepper balls, and put them all along the border. Probably wouldn't stop the illegals, but atleast it would make a good tv show.