Randomly shooting people crossing the border would likely not affect smugglers, who have little to do with the general population coming over and looking for work.

__________________
When they come a wull staun ma groon
Staun ma groon al nae be afraid
Thoughts awe hame tak awa ma fear
Sweat an bluid hide ma veil awe tears

It would certainly impact the decision of those who decide to use those smugglers, though, especially if they think they may be killed...