You don't get it, do you..
Your "normal operations" are NOT working and Americans are fed up with the results. That's why the Minuteman Project is on the border, calling attention to that fact, and demanding better money, resources, and equipment for the Border Patrol. Stop complaining that your business as usual is being disrupted because business as usual isn't cutting it!
Even the Mexican govt's border crossing guide says, "Don't run away from the Border Patrol, because they will only drop you off back at the border, where you can try again."
If the BP catches 20% of crossers on any given day (a very generous estimate) then they have a 96% chance of making it after 2 tries, and a 99% chance of making it after 3 tries. (20% X 20% X 20%)
In reality, the USBP doesn't stop anybody from entering the USA. Under "Catch and Release," they only delay them a day or two, at best.
Sensors, or no sensors.
Thanks for expressing my thoughts, exactly.