I'm serious, but the reason I have used from your comment is taking your assumptions as true. I'm all for the wall for a different reason; countries must control their borders or the people living there are not sovereign.
I have been to Mexico a few times (it's an awesome place!), right near the border, and much further south, but I did not feel it was a safe place. I know enough people with stories that I would rather not try to tell here. In Mexico, only the criminals and police are armed. Cross the border to the US, and volla, we all are equals. You can watch nearly endless TY* of cartel shootouts in Mexico (on residential streets), that stuff is practically impossible here, the elderly person down the street has weapons capable of hitting a body 200+ meters away. Mexico will be much safer when it's not just the criminals in the general population who can defend themselves.
It's going to be an interesting conversation when it's only US citizens that have DRM-free DMLS systems.
*I didn't check today, but I bet the memory hole is working on that...
Mexico doesn’t mass produce enough guns to feed the American market in any significant way, and their gun laws are much more strict than ours. It’s the other way around: the bad guys in Mexico get most of our guns from us, the gun shops in the USA with the highest sales are near the border.