Why do they want in? Because we make available to them paying jobs.
As soon as we make it economically unfeasible to hire illegal labor then there will be no more jobs for them and they will...
1) Go home.
2) Stop trying to get in.
Catch and release, even south of the border release, does nothing to alleviate the DEMAND for illegal labor that they are seeking to fill.
“All the guards in the world are not going to keep out people who want in.”
Plenty of land mines, a couple of bombing ranges, and a shoot on sight policy would do wonders to keep the illegals out.