At least you're honest about your support for the radical blurring (at least) of our borders. Most on your side will ridicule the possibility until its on the table then they will defend it.
What you refer to as a "radical blurring of our borders", sane people see as being important to protect our borders.
For all the inadequacies of inpections of containers entering our ports, those containers passing thru Mexico and Canada get less scrutiny.
It is important that the US have the authority/ability to control Mexico's and Canada's ports.