I know you're the wrong person to ask because you're not a free thinker, but if closing the border keeps out all the baddies, what do they need the wall for?

I have am aware of the meme that it's a good thing the government is shut down because it's not needed. With one of the branches getting their paychecks suspended being border security, and the shutdown being about border security, it is hard for me to see how this is anything but fucking retarded.