If you wife had not stopped innocent travelers in the first place maybe she could have more success with catching illegals. And why do does an American have to say 'Good Morning' when he is being hassled? Being stopped isn't like a dating bar now, is it? I mean you don't have to smile, right? Gal with a gun, stopping you to chat, and the guy has to LIKE it?
The checkpoint nearest our house is 0.3 miles from Mexico on I-8 and two agents have died there. One was run over by a rectal vent Mexican national drug dealer at the checkpoint and another drowned while trying to save a family in a car that ran into the All American Canal speeding around the checkpoint to avoid capture.
Unfortunately the guilty travelers are among the innocent travelers. You analogy to a law enforcement job to a dating bar sucks in it's frivolity.