There just isn't much security if people just run (or swim) across the border. A wall is like, $5 billion, but security personel will cost many time$ more in the long run, like, forever.
A wall or a fence or SLATS. Yada yada yada yada yada. More nothing from a nothing all about nothing. Won't something show up to stop all the nothingness? Thank you for your reply bh! :)