" If they wind up causing a revolt here, so much the better."
Nope, counter to your first statement - If they cause trouble they might get kicked back, and Mexico loses the Billion$ that gets sent back every year.
... and even if you are correct about the Mex government being in the drug trade, just why would they want to cause trouble ? Drug dealers like nice quiet closet junkies. No muss, no fuss
BEcause we make a mistake if we see the mexicans as being of one mind. There are individuals in the mexican army who are involved in the drug trade that can send their units out to protect a shipment or anything else they want. Anything can be done for a "small" fee. Come on, we all know this about that so-called country, it's a toilet. It's more or less anarchy. Sure there's a lot of nationalistic fervor to claim US territory (which they had held for like 20 years when we took it, so much for ancestral claims), but I don't think any of it is terribly organized.
I'm actually of the opinion that the flow of people here is impoverishing Mexico by bleeding them of human capital. It's stifling innovation here, because we're addicted to cheap labor. This is all seperate from the crime problem and security issues.
It's bad for them, and it's bad for us. I say shut it down until and unless they allow us to own land and operate businesses down there.