Not sure what you're asking, but when I go picking I won't pass low hanging visible fruit unless there is better fruit higher up. You really have to check around a bit, try some here or there, before you commit to one spot.
*sighs*
I'll try and be clearer, then. And to be fair, this isn't a US thing, we have EXACTLY the same habit here.
Border protection arguments are generally populist in nature. Same as tougher gaol penalties. That's not to say they are right or wrong, but listen to politicians talk about them and the arguments most commonly made are populist in nature.
For you guys, there is a focus on the Mexican border. Somehow you need to turn back the flood of humans charging across the border. For us in Australia, it's boat people. People floating up on dangerous water-craft from Indonesia, and landing on Australian soil uninvited.
Thing is, there is a massive focus on this politically, even while visa overstays contribute very heavily to illegal immigration in both the US and Australia.
You can be pro-border protection, if you like. I would humbly suggest you don't see border protection as a physical blockade of a land border, and you also suggest you hold your politicians accountable for holistic policies that deal with the actual problem, and not the populist view of the problem.
Politicians who reduce the argument to a simplistic one are both doing you a disservice and underestimating your intelligence.
Just my point of view. You can obviously think about this however you like.