Prevent illegal incursions across the border? Including violent cartels, not just “migrants”?

I fail to see how a country maintaining awareness of passages across its borders is a bad thing.

Especially when it comes to smuggling drugs across the border.

Of course, we could fix the drug smuggling by decriminalizing drug addiction and treating it like other public health issues. But the "War on Drugs" still rages on, after decades of failure.

Convert the straights into gays and the gays into straights?

No, they would be used to detect people crossing the border. What else would you use them for!?