"Just shoot them"
Someone probably should, but of course no one actually will. Not the Mexicans,not the Border Patrol,not the US Military, not even some horde of crazed angry deplorables, nor even the devil incarnate Donald Trump himself.
Seven, maybe ten, thousand in this particular "caravan". A drop in the bucket compared to the millions already here. Mere theatre.
It's already too late.
I posted this link before, in a conversation a while ago about unchecked immigration. Pretty sure no one bothered to read it. It's a book after all, and a work of fiction so it will take some effort, and a bit of imagination and perhaps some introspection to to get the point.
Even the first few chapters will give the gist to anyone who takes the time.
What is happening right in front of us is the beginning of the future envisioned in this:
http://www.jrbooksonline.com/PDFs/Camp_of_the_Saints.pdf