Actually this guy's argument about sovereignty is correct. Every nation has not only the right, but the duty to keep out infiltrators and/or invaders.

The Popes statement about building walls is silly and incorrect. It only makes sense in the most metaphorical sense. One only has to read the Bible to see this. We have a moral obligation to construct walls for safety and security purposes. To not do so can actually represent a mortal sin when the safety of those entrusted to us would be in peril.

Chiaramente, non e' "una voce" che se ne intende molto.