I think we've managed much better than that. It's not the DMZ or even in the same balllpark of a border. The people there are our friends ffs. They are not an enemy...yet.
Support this with indisputable facts please. Regardless of your answer it doesn't change the fact that a wall is a massive waste of money. The only point you've made that supports a wall is it's not something easily reversed. I agree. A complete waste of tax payers money wasted.
How is our relationship with Mexico complicated? We are deeply in bed with each other in so many ways. Why in the hell would you think it's a good thing to [Poor language removed] Mexico? Do you want an enemy on the Southern Border or do you want a friend?
Furthermore regarding your terrorism *whew we've swerved that with Mexico point...guess you have forgotten about the terrorist that was caught right here in Washington State after crossing the Canadian border. The fella headed to LAX.
The people there are our friends? That's the summary of the US-Mexico border? Look, I'm not demonizing Mexicans or saying I particularly prefer to have a physical barrier between "them" and "us." But the fact remains that Juarez, Matamoros, TJ, etc. have major violent crime issues which threaten to, and sometimes do, bleed over into the United States. Mexican law enforcement and the federal police are frequently in bed with the cartels. The Gulf Cartel is HQd about 2.5 miles from Brownsville, TX. Of course, that doesn't mean too much when the various cartels have presence in cities throughout the United States.
So no, I don't agree with your assessment of our border. I've been to all three of the border cities mentioned, and all have travel advisories warning against visits by the US State Department. The 2017 DEA report warns that the situation in El Paso, which surprisingly has generally not been consumed by cartel violence from Juarez, is worsening.
And yes, because of this, our relationship with Mexico is complicated. If we encourage Mexico to go back to war with the cartels, people die. We want the tide of human trafficking and drugs stopped, but Mexico doesn't want war in its cities like we saw in 2011. And the US doesn't want duffle bags of heads on courthouse door steps in San Diego.
This will probably lead to a discussion of US drug policy and how the US keeps the cartels in business, and that is true. But the concept that that there aren't literal war zones along the US border with Mexico is patently untrue.
As for how immigrants breach the border, I'd love to know. But considerable portions of our border are unmonitored, and we gauge the flow of illegal immigration using mathematical formulas. Anyway, if I were on your side of this discussion, I think the estimates that crossing have dropped to about 1/10th of what they were in the early 00s would be a far more useful argument.