I am not going to Mexico because at least some of my ancestors (Germans) were here 150+ years ago in Southern Indiana and a collateral ancestor was a Jesuit priest who was among the founders of Maryland. None of those had to submit papers to bureaucrats to enter. This was still a free country not the country of Mama, may I? If I did go to Mexico, I would at least find a lot better type of person than our border paranoids. The compromise os to improve things by bringiong some Mexicans here.
I take it that since you are so worked up about criminals, you won't mind jailing the armed border buffoons (well, Colorado!, actually) who take it uopon themselves to draw down on mothers and children with whom they are not all acquainted and ordering them to lie flat on the ground without warrant or probable cause (this amounts to a wrongful detention, if not kidnapping, and also assault and probably a bunch of other crimes and 14th Amendment violations and organized racketeering under RICO). Yeah, let's enforce the law and then there are the civil remedy statutes that should keep Barney Fife and friends bankrupt for life, even after prison.
You guys may not like this but the law also applies to you if it aplies to them. As to testimony by LAWBREAKERS, it happens all the time. Watch NYPD Blue. Three desperadoes are arrested in a multiple murder scenario (not mere border-jumping) and the cops fan out in three rooms assuring leniency to whomever breaks first and goes state's evidence. Sometimes he prosecutors get involved too.
Why not? You seem to believe Mexico is a wonderful conservative Catholic country. You believe every Mexican is hard-working and Republican ----- it should be a wonderful country. You really need to see the country first hand and then think about why you want to bring it all over here.