I'll give it one more go. If we don't have open borders to the north, then that must mean we have border security to the north, just not to the extent as we do to the south, and that's because the southern border is where the vast majority of illegals have been crossing. I think everyone agrees on those points.
The disagreement comes on how much border security is needed, what form it should take, and where money can be most wisely spent. That's fine and good and as it should be. The right's continued bellowing that anyone who does not support Trump's "wall" is some sort of open border loving socialist/globalist is asinine. Trump chose to poison the debate. He chose to tout some 30 foot high concrete wall from sea to sea that Mexico would pay for. All of Trump's calculated hate speak has come home to roost. Everyone had to have known that it would.
I see we've moved from answering the question I quoted earlier to a new context so there's no "one more go", it's a "new go".
So now that we've ducked the "But what about Canada?" silliness you've now just gone straight political. I've really little interest in engaging in that part of the equation. I'm not 100% convinced The Wall (love the album though) is the best balance of efficacy and cost efficiency but the sheer stridency of much of the Left's take on the matter along with the pathetic bleating about the idea of a physical border being "immoral" makes me believe it's more about Trump and less about sincere concerns of a secure border.