I was thinking that if people could coordinate things with the farmers and landowners along the border, maybe individual citizens could volunteer a week at a time to go down there and patrol. I would think that in light of current events there would be enough of a response to scare the living daylights out of these illegal immigrants: a bunch of armed angry Americans patroling the border.
Citizen groups have tried to do exactly that, and have been called racist homicidal maniacs by both governments. And that's without actually shooting anyone.
American landowners along the border who are robbed in their houses almost weekly who have shot and wounded intruders have been charged with assault etc. and are facing huge civil suits put on by "civil rights lawyers" from both nations.
Both governments have WANTED the de-facto open border, at least until 9-11.